The Official Downpipe/Test Pipe/Race Pipe Thread

[Spectrum24x]

Sorry for the noob question but is the cat in the downpipe the only cat on the car? If its not the only cat is it possible to pass emissions with a Catless dp?

[greatdane68]

It's not the only cat, and no, you can't pass emissions with a catless DP.

[gyoku2006@gmail.com]

good thread, very helpfull for when i get around to installing an exhaust system

[VertigoM]

Who has the new catted CS downpipe? Does the divorced wastegate design have a significant benefit over a bellmouth design?

[VertigoM]

Anyone?

[93silvergt]

Exhaust Downpipe Mazda 07 08 09 Mazdaspeed 3 Cat-less | eBay

Does this "m2 performance" have the secondary o2 bung extended to avoid a CEL? I can't see from the pictures

[EddyV1987]

Hey Guys quick question,

I have a MazdaSpeed 6 that has a Corksport racepipe and CBE. I'm looking into getting a downpipe but I can not use Corksports because they are Catless. With good ol Connecticut law I can not run catless. Will these other downpipes be compatible with what I'm running now? Will it make the car sound like Crap?

[smoogs12]

Originally Posted by EddyV1987 Hey Guys quick question, I have a MazdaSpeed 6 that has a Corksport racepipe and CBE. I'm looking into getting a downpipe but I can not use Corksports because they are Catless. With good ol Connecticut law I can not run catless. Will these other downpipes be compatible with what I'm running now? Will it make the car sound like Crap?

Just go catless and run a couple non-foulers on the second o2 sensor.

Tapa

[chuckms6]

it depends on how conneticut does emissions testing, visual, code scan, or sniffer, or all three?

[smoogs12]

Originally Posted by chuckms6 it depends on how conneticut does emissions testing, visual, code scan, or sniffer, or all three?

We only do a scan in CT.

If the tech is a reaaal dick he might visual check. But most give no fucks.

[chuckms6]

Originally Posted by smoogs12 We only do a scan in CT. If the tech is a reaaal dick he might visual check. But most give no fucks.

oh. then catless and delete code in ap. if they check system readiness then go with the o2 sensor spacer.

[smoogs12]

...if they check system readiness....

This they do. Dont go in after clearing codes or pulling power to the car. You will fail

[chuckms6]

Originally Posted by smoogs12 This they do. Dont go in after clearing codes or pulling power to the car. You will fail

fersure lol. yea o2 spacer is the way to go.

[Speed3eak]

Originally Posted by 93silvergt Exhaust Downpipe Mazda 07 08 09 Mazdaspeed 3 Cat-less | eBay Does this "m2 performance" have the secondary o2 bung extended to avoid a CEL? I can't see from the pictures

Yes you can, And no it doesn't.

Do you have a 1/2" drill bit? Order some spark-plug non-foulers and make the extender yourself. It's really simple and works like a charm.

Does anybody make a 3" v-band upper downpipe for the MS3? I haven't been able to find one. The old style UR DP looks like it was made for a 3" v-band but knowing UR they would most likely charge extra for a non-standard option. It doesn't look like the MS3 flange -> v-band adapter would work either because I'd be working with a very limited amount of space.

[09Speed3Z]

@Raider.......this isn't a sticky anymore??

[Raider]

Not sure whathappened, but it is fixed

[William.Fraim]

Sorry for the noob question. I want to replace my stock dp. If i replace the fuel pump internals would i be fine? Or do i still need to raise the RPM's with an AP? Only reason I ask is that if i need the AP im scrapping the dp idea for now cuz I'm on a low budget right now.

[jeopardy98]

1. rmm
2. ap
3. fp
4. sri
5. dp

4 and 5 can be switched but I wouldn't run a dp without an ap to monitor.

[William.Fraim]

OK thanks for the help. Just one more question. What are rmm and sri?

[Dmurray06]

Rear motor mount, Short Ram Intake

Because you have donate mod.

[William.Fraim]

Ok and thanks again for the help.

[agentgordon27]

I noticed the mention to smoking due to 3" DP, does that include both catted/catless? Will having a high flow cat help with the back pressure issue or no difference?

[tdjach]

great thread

[IzSo_MS3]

Anyone running a full race DP


*edit: I'm a ginormous cocksucker who doesn't read, research, or pay attention. Please flame me, it makes my peepee come out from it's reverse status.

[Dmurray06]

Originally Posted by IzSo_MS3 Anyone running a full race DP

A downpipe is a downpipe. Full race is just expensive as shit...they all do the same thing.

[GODspeed7]

Originally Posted by IzSo_MS3 Anyone running a full race DP

Weren't you just told that a downpipe is a downpipe? How many threads are you going to post in or create while asking the same question and getting the same answer? @chimmike;

Tapatalk LIKE A BOSS!

[IzSo_MS3]

I was just asking if anyone was running a full race that's it sorry if I pissed anyone off but dam

[TiGraySpeed6]

Far as I know a few people run the FRDP. If you want to go that route then do. Many, myself included don't see any sense in paying so much more for the name, but lots of people want the name as much as the product.

Sometimes it just for the name, sometimes for the support or customer service. In the case of down pipes, I can get 3 or 4 m2's for the same cost, and the quality is comparable enough that I'm satisfied.

As for performance, a dp is a dp is a dp...

[jeopardy98]

Originally Posted by IzSo_MS3 I was just asking if anyone was running a full race that's it sorry if I pissed anyone off but dam

*damn

[Speed3eak]

Originally Posted by TiGraySpeed6 As for performance, a dp is a dp is a dp...

For catless, yeah - but IDK about the catted downpipes. For example, I have a CNT and the catalytic converter looks like a few sheets of crimped metal in concentric circles. I'm not so sure that it so much converts catalytics as it just cools down the exhaust flow. It isn't even very good at that - I got the same PID people get from running catless. Backed out the o2 sensor with a single spark plug defouler (two defoulers set of the "cat is clogged" PID) and everything was a-ok.

I don't mind as the reason I got the cat in the first place was to prevent boost spikes. I'm more than happy with it, largely because of the price - $300 shipped. The cast bell-mouth housing is awesome, welds are solid, etc. etc.

I know that UR has two different catalytic converter options. I don't know if there's a huge difference between the two unless you're running like 500 whp or something, and even then you'd just leave the cat out.

I've been running 17:1 AFRs at cruise/low loads and after 5k all seems well. Latest vDynos show 280whp and 320 lb-ft which is about right for 17 psi and 11* of timing @ RL. I'm not running any meth and my car is knock-happy so my timing curve is probably about 2* less than anyone else you're going to see here. If it goes bad or w/e I'll either pull off the pipe and knock it out or have a shop cut it out and weld in a straight pipe. Probably the former as I'm a pretty cheap bastard.

[Chimmike]

Originally Posted by IzSo_MS3 I was just asking if anyone was running a full race that's it sorry if I pissed anyone off but dam

what the FUCK does it matter ?

PLEASE, spend that much money on a downpipe. I beg of you. While I'm sitting here around 450whp with an ebay downpipe. PLEASE, buy the full race downpipe.

fuckin assclown.

[IzSo_MS3]

I didn't say I was buying one but I do have the resources to buy one and much more an I won't break my bank account doing so I just set my finances up my hole life to do stuff like that you just got to work at it an besides the point I'm going with ATP Long DP what the fucking fuck

[jeopardy98]

*whole

[chuckms6]

Originally Posted by jeopardy98 *whole

There were much more than that lol

Tapatalking

[Raider]

I made one out of dryer vent piping and a pie tin and found it clears the P2187 CEL. Awesome.

[jeopardy98]

You did use the v-band clamp to secure it to the turbo housing, right?

[IzSo_MS3]

Going MacGruber on that shit lol!!

[MS3-a(sore)ASS-rex]

Originally Posted by IzSo_MS3 Going MacGruber on that shit lol!!

Banned from the thread for being an annoying cocksucker. Crap up someone else's thread.

[GODspeed7]

Tapatalk LIKE A BOSS!

[JLM027]

Awesome Post. I just installed a downpipe to my ms3. Would you happen to know if I need to change the map in the AP from stage 1 to stage 2?