The Official Downpipe/Test Pipe/Race Pipe Thread

[robbspeed]

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

Open accessport manager with your accessport hooked up to the computer. Click filter and select "logs". It should give you list of every log on your accessport. Select the log you want to look at and click the save to computer button. It should be to the right of the list. Once its saved open ATR and click "view". Then select "data log viewer". Then click "file" and select "open data log". You should then see the log you saved and open it.

[570msp]

you can also read the logs in excel as a spreadsheet.

[Gitcherex]

Ive been searching for information regarding the Mazda donut exhaust gasket. Haltech recommended it in his how-to thread and there was another thread where cpe was quoted to have said no gasket is required for the meet up between dp and cbe. Once again, Im asking here as to not make a new thread lol (as it is related to downpipes). any recommendations?

[robbspeed]

Originally Posted by Gitcherex Ive been searching for information regarding the Mazda donut exhaust gasket. Haltech recommended it in his how-to thread and there was another thread where cpe was quoted to have said no gasket is required for the meet up between dp and cbe. Once again, Im asking here as to not make a new thread lol (as it is related to downpipes). any recommendations?

Are you asking about a donut gasket or what downpipe to get?

[zjnspeed3]

Originally Posted by Gitcherex Ive been searching for information regarding the Mazda donut exhaust gasket. Haltech recommended it in his how-to thread and there was another thread where cpe was quoted to have said no gasket is required for the meet up between dp and cbe. Once again, Im asking here as to not make a new thread lol (as it is related to downpipes). any recommendations?

I have the Cp-e catless downpipe and I didn't use a donut gasket. Car runs fine and haven't heard any exhaust leaks yet.

[Rommel043]

yeah I got an EBAY M2 catless downpipe and this flange end literally bolts into the stock CBE

picture attached is also a CP-E downpipe

[Gitcherex]

Originally Posted by robbspeed Are you asking about a donut gasket or what downpipe to get?

i was asking about the donut gasket lol. Ive got the m2 being shipped now and I wanted to make sure that I had everything I needed for the install. ive seen 2 mentions of it, both with differing views

[robbspeed]

Originally Posted by Gitcherex i was asking about the donut gasket lol. Ive got the m2 being shipped now and I wanted to make sure that I had everything I needed for the install. ive seen 2 mentions of it, both with differing views

Oh. When I installed mine I had to use an adapter and the new donut gasket I bought didn't fit the catback side of the adapter some how. So I just put a good 40 ft lbs on the bolts and they don't leak one bit. So you can get away with not using it.

[Gitcherex]

sweet thanks guys! Now i dont gotta worry about having a leak lol. Upgrade next week!

[aviator79]

Ebay DP that was on car needed new flex pipe and wanted to install cat.

[Richys10]

Not too sure what to get. What will give me th most gains, a OBX turbo back exhaust or just a CNT long Catless downpipe with OEM cat back?

[CWP_MS3]

Originally Posted by Richys10 Not too sure what to get. What will give me th most gains, a OBX turbo back exhaust or just a CNT long Catless downpipe with OEM cat back?

Either way is fine. The OBX will give you a more aggressive sound. However, from what I've seen, its one of the quieter aftermarket exhausts.

Just as an FYI, several people have had fitment issues with the speed daddy catless DP; myself included. Its made a bit short. The DP still fit, but it pulled my entire exhaust forward to mate up with the DP. Had to use C clamps to install it the first time.

Oh, and an extended rear o2 causes a CEL on the Pus. So if you can, one without an extended bung would be preferred. If you have the funds, have someone either cut it or weld in a normal one altogether, before you have it installed. Or do what I do, install it and shut the check engine lights off. lol

[T_DUBL_U]

I've done some searching and haven't really found an answer, but I have a 09 ms3 and the catback and the tail say mazdaspeed. I assume this is an upgrade over stock but I can't find anything about it. Will I be better off getting another catback or is the mazdaspeed version as good as the others.

[CWP_MS3]

A catback is purely sound, so go with whatever tingles your sack.

[Richys10]

I just bought a CNT catless Downpipe and wanted to use a O2 sensor extender but can't seem to find where to buy one. I'm not sure if the Downpipe already comes with one but does anyone know where I can get an O2 sensor extender? in case mine doesn't come with one

[CWP_MS3]

You don't want one. Read my post a few posts up about the extenders.

[Richys10]

Ok I see. But arnt O2 sensor extenders made to prevent CEL. How would it cause it to have a CEL?

[CWP_MS3]

Originally Posted by Richys10 Ok I see. But arnt O2 sensor extenders made to prevent CEL. How would it cause it to have a CEL?

Well the point of them is to lift the o2 out of the stream of emissions so it doesn't read an excessive amount of emissions passing after the cat. However, on our cars (more specifically the 2nd gen) lifting the o2 out of the stream makes the sensor read too little emissions, and it believes the sensor is failing.

I have read of people not even getting a CEL on a catless DP that had a standard bung. With that said, I personally have CELs from the extended bung on my DP. It thinks my o2 sensor is shot, and its probably right these days, after running e85 for like 3 straight years.

[Richys10]

Ohh ok I see . Makes sense. Thanks man!

[Khang88]

How do you guys feel about ebay downpipes?? Crap? Or descent?

[T_DUBL_U]

Ive had mine for about 3 months and no problems. I have heard people having cracks at the welds. Speed daddy seems to be the way to go for the ebay DPs.

[CWP_MS3]

Originally Posted by Khang88 How do you guys feel about ebay downpipes?? Crap? Or descent?

Ebay is fine. Some on the pus have been short, and it still fits, but as far as I know the 6 its always been fine.

[Gitcherex]

Ive had my m2 catless downpipe (ebay) for almost 6-7 months now. Only issues I've had is their crappy ass gaskets. Mine burnt to a crisp lol

[CWP_MS3]

I reused my stock gasket. Fuck their shit.

[Gitcherex]

I went back in 2 weeks ago and put the oem dp gasket back on. Tried using some 800* gasket maker to fix the gasket on the vband-3inch pipe (dont recall what its actually called), seems to have worked but idk lol

[Khang88]

So as far as quality with the downpipe itself and power gains, it good?

[CWP_MS3]

Originally Posted by Khang88 So as far as quality with the downpipe itself and power gains, it good?

Power gains on stock turbo are pretty minimal compared to a test pipe only car. You may have a few more over them, but not much. 3-5+ whp. It will definitely spool faster than a catted car for sure. I mean, a K04 is instant spool, but it was definitely noticeable and way more aggressive ramping IMO.

When it comes to BT, you will need the DP.

Personally, an ebay DP and TP are relative in price. Might as well get the m2 DP and do it right to begin with.

[Rommel043]

Originally Posted by CWP_MS3 Power gains on stock turbo are pretty minimal compared to a test pipe only car. You may have a few more over them, but not much. 3-5+ whp. It will definitely spool faster than a catted car for sure. I mean, a K04 is instant spool, but it was definitely noticeable and way more aggressive ramping IMO. When it comes to BT, you will need the DP. Personally, an ebay DP and TP are relative in price. Might as well get the m2 DP and do it right to begin with.

Yeah I agree^^^

Ive had mine for about 30k no issues. get rid of the junk gasket they give you and reuse the stock one.

The DP came up a little short on my genpu but thats nothing longer bolts cant fix.

if you have a genpu, please cut the secondary bung down to half size and/or drill a new hole with a shorter bung. the secondary NEEDS to be close to exhaust stream otherwise youll run rich as fuck AFR's and throw two codes.

I think its the best bang for your buck. Hell, I think it sounds pretty damn good with jsut this DP and the stock catback.

[Khang88]

Thanks guys. Im really considering an ebay dp. Everything else is just too pricey.

[CWP_MS3]

I don't think the MS6 DP has the extended rear o2 bung on it. If it does, have a shop weld a standard in before you install it.

[Gitcherex]

Originally Posted by CWP_MS3 I don't think the MS6 DP has the extended rear o2 bung on it. If it does, have a shop weld a standard in before you install it.

It does not, so all ya gotta do is make sure you dont fuck up the O2 sensors while taking em out, and you are golden

[Nel Mazdaspeed]

Originally Posted by Khang88 How do you guys feel about ebay downpipes?? Crap? Or descent?

ive had my M2 downpipe for 2 years, absolutely no problems..

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[Khang88]

Cool. How's the power gains on the m2?

[Nel Mazdaspeed]

i honestly dont have a diff DP to make comparisons, but according to my tuner they are similar if not the same in gains. the only diff is the quality and workmanship and price.. imo

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[Lambo0311]

If anyone can give me opinions on which exhaust is best for the MS3 I'd greatly appreciate it. I just bought my 2012 speed 3 about a month ago.

[robbspeed]

Originally Posted by Lambo0311 If anyone can give me opinions on which exhaust is best for the MS3 I'd greatly appreciate it. I just bought my 2012 speed 3 about a month ago.

Read your welcome PM. Make an introduction thread and here you go. Definitive Exhaust Thread

[IT GUY]

So I don't post often on here. Hell I haven't even been searching forums much lately. But I just got my CNT 3" catless downpipe in and installed. It was on back order and I waited for months to get it in. I figured for the price and what I have heard and read I couldn't go wrong. In the end I think I'm in love with the feel and sounds. However I cannot recommend this downpipe because of a major issue I had with their product. If you look at the pictures of the downpipe you will see it looks like a decent piece, until you look at the last few pictures when i went to go and install it. The holes on the bellmouth to mount on the turbo no only are a bitch to get to the studs, but they did not line up correctly and had to be filed out larger in order to make the bolts line up correctly. If I was not in the right place doing this it would have been a long day of hell just to go back to stock. Luckily we were able to file the holes larger and put this thing up and down on the lift repeatedly until the holes lined up correctly again.
Now it is time to play with tune and i will try to keep you guys updated on that somewhere else on the forums.
Then next on list is to cut out the 2.5 inch flange on the Magnaflow 15557 exhaust and put on a flat 3 inch flange to match this downpipe (just threw on a flat gasket for now knowing its getting done soon.

[eliwwjd]

I know this thread is old but im getting ready to purchase a catted downpipe but im still debating on whether to get divorce or bellmouth due to many different opinions. Justin recommended me corksport or cobb. One is divorce and one is bellmouth. I was reading on other subaru forums that divorce was the way to go, having separate tubes avoiding turbulence, boost spikes and the same time exhaust flow is smoother, giving the car the chance to produce hp and tq efficiently. Others think that bellmouth is the way to go when you have high boost applications and that this model is best suited for the mazdaspeed 3. Normally drag race cars have separate tubes, the wastegate comes out the side of the car or the bottom while the turbo tube out the hood in some cases(divorce way)
With what model do you guys recommend I should go? Ive been inclined towards the divorce but you guys tell me what is your thought

[IT GUY]

I don't have any professional or mathematical advice on this matter. All I can say is mine has treated me great since it's been in. Surprising amount of power being pushed out of my stock ko4.

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[Dennisms3]

Originally Posted by eliwwjd I know this thread is old but im getting ready to purchase a catted downpipe but im still debating on whether to get divorce or bellmouth due to many different opinions. Justin recommended me corksport or cobb. One is divorce and one is bellmouth. I was reading on other subaru forums that divorce was the way to go, having separate tubes avoiding turbulence, boost spikes and the same time exhaust flow is smoother, giving the car the chance to produce hp and tq efficiently. Others think that bellmouth is the way to go when you have high boost applications and that this model is best suited for the mazdaspeed 3. Normally drag race cars have separate tubes, the wastegate comes out the side of the car or the bottom while the turbo tube out the hood in some cases(divorce way) With what model do you guys recommend I should go? Ive been inclined towards the divorce but you guys tell me what is your thought

Drag racing cars have external wastegates thats why they have a downpipe and and dump pipe for the wastegate. Outr k04 is internally wastegated, so just get a bellmouth and be done with it. Thats what the majority of the people here including me have and no issues.


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