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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catback exhaust or catless downpipes



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      10-09-2011, 05:01 PM   #1
Beemw335
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Catback exhaust or catless downpipes

Hey guys, recently tuned my car, and now Im seeking a bit more power/sound.
Im not a power freak so it doesnt bother me to scarifice a bit of power for getting a lot more sound.
I want to reduce back pressure to help my spool up and also put less stress on the turbos, so I want to get a ae catless exhaust. My question is would this reduce back pressure by a big amount, or should I forget the exhaust and just get some ar catless downpipes?
I want an exhaust due to better sound and less trouble to swap oit with stock for warranty claims
Do you guys think I should just get downpipes? or would an exhaust reduce backpressure enough for me to help spool up and even allow me to run map2 on my procede(it would be dci the ae exhaust and 94 octane).
Thanks
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      10-09-2011, 05:03 PM   #2
enrita
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Catless downpipes. Thats all you need.
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      10-09-2011, 05:07 PM   #3
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Definitely downpipes. The exhaust will do nothing to help your turbos as long as they are dealing with the restriction from the cats in the downpipes
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      10-09-2011, 05:09 PM   #4
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Agreed above cat less DP's will be fine. Far less turbo lag.
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      10-09-2011, 05:14 PM   #5
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Quote:
Originally Posted by enrita View Post
Catless downpipes. Thats all you need.
Quick question, sorry about the highjack, PM won't work yet.

How do you find using your Procede with your snow meth kit?

Particularly like how i can use Stetts CP with a BOV has with the procede meth kit I'm stuck in using their CP for compatibility reasons and a DV instead.

Was going to go for a proceed tune, and to keep it easy get their meth kit.

But SP's looks good.
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      10-09-2011, 05:19 PM   #6
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Alright, so downpipes it is!!
Quick question, for install, what could I expect to pay? since I wont br installing these myself.
Thank you.
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      10-09-2011, 05:27 PM   #7
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Quote:
Originally Posted by E93Blackhawk View Post
Quick question, sorry about the highjack, PM won't work yet.

How do you find using your Procede with your snow meth kit?

Particularly like how i can use Stetts CP with a BOV has with the procede meth kit I'm stuck in using their CP for compatibility reasons and a DV instead.

Was going to go for a proceed tune, and to keep it easy get their meth kit.

But SP's looks good.
every meth kit is compatible with the procede as long as you have a meth flow signal connected to a wire in the procede for the map change (see sp safe injection, labonte etc etc)
Best though is to go with their pwm kit since is better integrated software wise.
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      10-09-2011, 05:27 PM   #8
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Quote:
Originally Posted by Beemw335 View Post
Alright, so downpipes it is!!
Quick question, for install, what could I expect to pay? since I wont br installing these myself.
Thank you.
probably takes 2-4 hours to install.
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      10-09-2011, 07:31 PM   #9
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downpipes... cheaper and more bang for the buck!
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      10-09-2011, 07:55 PM   #10
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Quote:
Originally Posted by Beemw335 View Post
Alright, so downpipes it is!!
Quick question, for install, what could I expect to pay? since I wont br installing these myself.
Thank you.
take about 2 hrs with the lift, so you looking at $180 - $200
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