Catback exhaust or catless downpipes

Beemw335 · 10-09-2011, 05:01 PM

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

enrita · 10-09-2011, 05:03 PM

Catless downpipes. Thats all you need.

Brey335i · 10-09-2011, 05:07 PM

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

E93Blackhawk · 10-09-2011, 05:09 PM

Agreed above cat less DP's will be fine. Far less turbo lag.

E93Blackhawk · 10-09-2011, 05:14 PM

Quote:

Originally Posted by enrita

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.

Beemw335 · 10-09-2011, 05:19 PM

Alright, so downpipes it is!!
Quick question, for install, what could I expect to pay? since I wont br installing these myself.
Thank you.

enrita · 10-09-2011, 05:27 PM

Quote:

Originally Posted by E93Blackhawk

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.

enrita · 10-09-2011, 05:27 PM

Quote:

Originally Posted by Beemw335

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.

SeanS54 · 10-09-2011, 07:31 PM

downpipes... cheaper and more bang for the buck!

Dark9T · 10-09-2011, 07:55 PM

Quote:

Originally Posted by Beemw335

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

10-09-2011, 05:01 PM	#1
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	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 Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Catless downpipes. Thats all you need. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-09-2011, 05:07 PM	#3
Brey335i Banned 118 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	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
E93Blackhawk First Lieutenant 32 Rep 344 Posts Drives: 2008 335i M sport Join Date: Oct 2011 Location: London iTrader: (0)	Agreed above cat less DP's will be fine. Far less turbo lag.
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10-09-2011, 05:19 PM	#6
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	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, 07:31 PM	#9
SeanS54 Captain 174 Rep 860 Posts Drives: M4 ZCP, E46 M3, '21 Tacoma Join Date: Jan 2011 Location: Bay Area, CA iTrader: (20)	downpipes... cheaper and more bang for the buck! __________________ https://www.youtube.com/user/SeanS54/videos
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