The Official Downpipe/Test Pipe/Race Pipe Thread

[Rommel043]

my question is, will any 3" long downpipe mate right up to the stock catback exhaust or will i have to get a donut adapter?

Thanks fellas

[aromig]

Originally Posted by Rommel043 my question is, will any 3" long downpipe mate right up to the stock catback exhaust or will i have to get a donut adapter? Thanks fellas

If the catback side flange tapers to 65mm, you're good. If it stays 80mm/3inch all the way, it won't work unless you can rig it somehow. Personally recommend against that though.

[GregScuba]

Not sure if this has already been mentioned, but I just stumbled upon this, and thought I'd throw it in the mix. Apparently Magnaflow makes a DP. No idea how it performs though.
Magnaflow/Catalytic Converter 51545 at AutoZone.com

[Inquisitive]

Several members have the Magnaflow CBE, but I haven't seen the Magnaflow DP before. Thanks for sharing this.

Not for sale in the state of California - lol

Do you happen to know what it fits (MS6, MS3 Gen1 and / or Gen2)? It just says Mazda(10) when I push "Vehicle Fitment".

Also, can you see a price? It might be picking up my foreign address or that I do not have a logon.

[GregScuba]

Originally Posted by Inquisitive Several members have the Magnaflow CBE, but I haven't seen the Magnaflow DP before. Thanks for sharing this. Not for sale in the state of California - lol Do you happen to know what it fits (MS6, MS3 Gen1 and / or Gen2)? It just says Mazda(10) when I push "Vehicle Fitment". Also, can you see a price? It might be picking up my foreign address or that I do not have a logon.

Price I see is $490. Fitment is for gen1 or gen2 Mazdaspeed3.

[Gorky_Park]

I have a test pipe already, so wanted a catless short DP.

I can't seem to find M2 brand on eBay anymore, should I go with Mazda mazdaspeed 3 MS3 2 3L Turbo I4 O2 Bungs Exhaust 3 inch Downpipe with Flex | eBay or J2 Racing Turbo Downpipe Down Pipe Exhaust 07 09 Mazda 3 MAZDASPEED3 Disi MZR | eBay ? One is $90 another is $120.

I plan on getting HPFP internals, and AP with Freektune OTS+ 93 map

Thanks

[WetzMS3]

Originally Posted by Gorky_Park I have a test pipe already, so wanted a catless short DP. I can't seem to find M2 brand on eBay anymore, should I go with Mazda mazdaspeed 3 MS3 2 3L Turbo I4 O2 Bungs Exhaust 3 inch Downpipe with Flex | eBay or J2 Racing Turbo Downpipe Down Pipe Exhaust 07 09 Mazda 3 MAZDASPEED3 Disi MZR | eBay ? One is $90 another is $120. I plan on getting HPFP internals, and AP with Freektune OTS+ 93 map Thanks

Most of the e-bay downpipes are the same thing, just re-branded.

[elementality199]

what size are the non foulers? i went to auto zone and had like 5 different sizes, going to go full catless and want to buy these to install with it.

[dutchbuffalo]

I bought the ebay testpipe for my MS6 and it doesn't line up right, both ends are straight up and down and one should be angled. Anyone else have this problem and came up with a solution ?
http://www.motorxp.info/gqmotor/img/TP-3016-5.JPG ebay testpipe
http://corksport.com/images/thumbnai...g?t=1439599012 Corksport testpipe

[fd97]

So im running an ebay downpipe with a built in spacer. Because of the spacer i'm getting a lean code because apparently in MS3's both o2 sensors measure afr. I'm looking to get a tune soon and i'm wondering if this can have negative effects.

[littleloogy]

Originally Posted by fd97 So im running an ebay downpipe with a built in spacer. Because of the spacer i'm getting a lean code because apparently in MS3's both o2 sensors measure afr. I'm looking to get a tune soon and i'm wondering if this can have negative effects.

Nice first post... Did you read your welcome PM?

[fd97]

i did

[Turbo_Steve]

Originally Posted by fd97 i did

I assume you are running upgraded fuel pump internals and have a CUSTOM tune then...

If not, you will find out what happens soon enough.

[fd97]

hpfp internals yes, no tune tho. I don't think it's actually running lean, the O2 sensor spacer is causing the lean code

[littleloogy]

Originally Posted by fd97 hpfp internals yes, no tune tho. I don't think it's actually running lean, the O2 sensor spacer is causing the lean code

You put the spacer on the primary O2 sensor?

[speed23]

IIRC, they dont both register afr, only the first one. You better double check that just incase.

[fd97]

Originally Posted by speed23 IIRC, they dont both register afr, only the first one. You better double check that just incase.

Thats what i thought too nut only people running spacers get lean codes

Originally Posted by littleloogy You put the spacer on the primary O2 sensor?

The spacer is built in. And that would be of no good use to have a spacer on the primary because it's before the cat and wouldn't measure efficiency

[Turbo_Steve]

You are running lean because you don't have a custom tune, or because of some other issues you have with the car.

The rear narrowband o2 helps with correcting sensor drift of the primary wideband o2. over time with the rear sensor spaced out, the primary will drift rich. This will make the car run richer than what the 02 sensor is reading.

Either plug the rear bung and have a standard bung welded in, or delete the rear 02 and turn off the codes.

AND GET A TUNE BEFORE YOU BLOW UP

[fd97]

Originally Posted by Turbo_Steve You are running lean because you don't have a custom tune, or because of some other issues you have with the car. The rear narrowband o2 helps with correcting sensor drift of the primary wideband o2. over time with the rear sensor spaced out, the primary will drift rich. This will make the car run richer than what the 02 sensor is reading. Either plug the rear bung and have a standard bung welded in, or delete the rear 02 and turn off the codes. AND GET A TUNE BEFORE YOU BLOW UP

Then why does the code only appear with the spacer? When the stock dp is on no codes appear

[fd97]

And what is O2 sensor drift?

Also, if the ecu got a rich signal from the primary O2, then wouldn't the lean code come from the injectors being maxed on stock ecu settings because it's running too rich?

[Turbo_Steve]

When you swap to a catless downpipe, you remove a big source of back pressure. Your engine will flow more air at the same amount of boost as before. You need to tune for this. These cars are very sensitive to removing the cats and many have blown up from not being tuned and having upgraded fuel pump internals. Swapping to catless without a tune = lean.



Get a tune....

Unless you want to buy a new motor.

I'm done

[CWP_MS3]

The extended rear oxygen sensor bung should only through codes for the rear oxygen sensor. Meaning, it thinks its broken because its not reading an adequate amount of emissions.

For example, I get a P0137 and P0139, and now I have a P0140. lol

P0137 - Rear 02 low voltage P0139 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor2) P0140 - 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)

[Gitcherex]

I just purchased my 06 MS6 about a month ago, it came with magaflow cbe. I was changing the oil the other day and i checked out the dp. the (midpipe?) doesnt appear to be stock (pic attached) as i dont see the cat. can anyone confirm? would this mean I only need a new downpipe (rather than dp and test pipe)?
p.s. i checked for pics of the oem exhaust system but couldnt find any, and figured this would be the best place to ask rather than make a new post about downpipes.

[570msp]

Originally Posted by Gitcherex I just purchased my 06 MS6 about a month ago, it came with magaflow cbe. I was changing the oil the other day and i checked out the dp. the (midpipe?) doesnt appear to be stock (pic attached) as i dont see the cat. can anyone confirm? would this mean I only need a new downpipe (rather than dp and test pipe)? p.s. i checked for pics of the oem exhaust system but couldnt find any, and figured this would be the best place to ask rather than make a new post about downpipes.

That is indeed an aftermarket test pipe. What brand I have no idea. As far as replacing the downpipe you have one of two options. One is to get a short downpipe (Like the corksport dp) which bolts up to your current test pipe. Or if you get a long downpipe it will replace both the stock DP and test pipe you have now (Like CPe, M2, etc). If you read the OP it explains the difference between both DPs. Hope this helps.

[Gitcherex]

Originally Posted by 570msp That is indeed an aftermarket test pipe. What brand I have no idea. As far as replacing the downpipe you have one of two options. One is to get a short downpipe (Like the corksport dp) which bolts up to your current test pipe. Or if you get a long downpipe it will replace both the stock DP and test pipe you have now (Like CPe, M2, etc). If you read the OP it explains the difference between both DPs. Hope this helps.

Thanks for the quick reply! I was reading about the downpipes and test pipes for the last couple of weeks, and finally checked what I had a couple days ago. I just wanted to make sure before i spent the money on the new dp/testpipe. now it can go towards a tune lol

[570msp]

Before you go spending money on a new DP make sure you have HPFP internals installed. Hopefully whoever had the car before you got it tuned and replaced them already. HPFP internals first, Tune second, even if it's not a full custom I'd recommend the $75 tune from Freek. He will get you to where your car is running safe so when you have the money you can get that DP and not a new engine.

[Gitcherex]

The previous owner had told me the car had upgraded hpfp internals. While i have kept an eye on the fp during my wot pulls and havent noticed any dips, short of pulling it apart, is there another way to verify this?

[robbspeed]

Originally Posted by Gitcherex I just purchased my 06 MS6 about a month ago, it came with magaflow cbe. I was changing the oil the other day and i checked out the dp. the (midpipe?) doesnt appear to be stock (pic attached) as i dont see the cat. can anyone confirm? would this mean I only need a new downpipe (rather than dp and test pipe)? p.s. i checked for pics of the oem exhaust system but couldnt find any, and figured this would be the best place to ask rather than make a new post about downpipes.

I was looking at your vehicle info and saw hpfp internals in the description. How do you know you have them?

[Gitcherex]

The guy i purchased the vehicle from had told me the hpfp internals were installed, but other than that Im not 100% sure. I have kept an eye on my fuel pressure during wot pulls, and there are no dips (highest i remember is about 1850). I have the cobb ap gauge showing me the hpfp actual pressure (among other things)

[hollar1211]

Do you mean lowest was 1850?

Sent from my 0PM92 using Tapatalk

[Gitcherex]

the highest i recall seeing was about 1850, very likely that it was higher. Ill do a wot log and see what the highest comes out to be. Ive decided to actually pull it out and clean the hpfp (and to verify its been upgraded) once i get my jbr stage 2 sri. kill 2 birds with one stone.

[robbspeed]

Originally Posted by Gitcherex the highest i recall seeing was about 1850, very likely that it was higher. Ill do a wot log and see what the highest comes out to be. Ive decided to actually pull it out and clean the hpfp (and to verify its been upgraded) once i get my jbr stage 2 sri. kill 2 birds with one stone.

That's a good idea. I would just inspect. There should be no need for cleaning unless the thing was running E. With good fuel and regular oil changes they should be in fine shape. Also, when I go wot my hpfp actual pressure spikes to the mid 1800's and then holds in the upper 1700's through out the rev range and I have a 3" catted DP with stage 2 map. So unless I'm missing some piece of info on the ms6 i'd say that's good fuel pressure for after market internals.

[Gitcherex]

Originally Posted by robbspeed That's a good idea. I would just inspect. There should be no need for cleaning unless the thing was running E. With good fuel and regular oil changes they should be in fine shape. Also, when I go wot my hpfp actual pressure spikes to the mid 1800's and then holds in the upper 1700's through out the rev range and I have a 3" catted DP with stage 2 map. So unless I'm missing some piece of info on the ms6 i'd say that's good fuel pressure for after market internals.

Alright. 2 pulls later and the hpfp actual maxed out at 1849 and stayed around 1600s-1700s during each pull (3rd/4th x2). ill still pull it to be sure! and no, no E yet but im running seafoam through each tank to clean it out to do a mix in the future.

[deasuma]

Did it dip below 1600 at all?

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[robbspeed]

Originally Posted by Gitcherex Alright. 2 pulls later and the hpfp actual maxed out at 1849 and stayed around 1600s-1700s during each pull (3rd/4th x2). ill still pull it to be sure! and no, no E yet but im running seafoam through each tank to clean it out to do a mix in the future.

Upper 1600's? I don't like to put additives or cleaning agents in my vehicle so I can't comment on what effect that will have. I think one of the moderators on this forum bench tested seafoam and found it to do nothing.

[Gitcherex]

Yeah it dipped down into the upper 1600s (didnt see anything lower) then stayed around mid 1700s. I tried to log it, but im unsure on how to access it atm lol.
i was reading up on a thread in the e85 section, he seafoamed the tank a few times and i dont think he had the black death issue

[robbspeed]

Originally Posted by Gitcherex Yeah it dipped down into the upper 1600s (didnt see anything lower) then stayed around mid 1700s. I tried to log it, but im unsure on how to access it atm lol. i was reading up on a thread in the e85 section, he seafoamed the tank a few times and i dont think he had the black death issue

If you go into "gauges" you just hit the center button it should start logging. Then hit the center button again to stop logging. You might have to go into settings in the gauges function and select all the parameters you want logged if it isn't already set up. It may be different if you have the v2

[Gitcherex]

that part I did, but actually viewing the logs is where i am stuck.
I did some quick searching. GlorifiedBozo is the OP of that thread. he did use Phates inline fuel filter however as well though.

[robbspeed]

Originally Posted by Gitcherex that part I did, but actually viewing the logs is where i am stuck. I did some quick searching. GlorifiedBozo is the OP of that thread. he did use Phates inline fuel filter however as well though.

You need accessport manager and accesstuner race

I'm assuming you have them. If not, go to cobbs website and order it for free. Then they'll send you a link to download within 24 hrs

[Gitcherex]

Yes, ive got them, thought those were just for tuning though. Ill try and pull up the logs and see how they look.