Gains from Catless DPs

bryce · 10-11-2011, 03:48 PM

Quote:

Originally Posted by 2wheelsrbetter

uh-oh, i haven't been paying attention lately. N55 mid pipe on an N54? what are we talking about here? someone point me to a thread, i just searched and didn't find anything...

i don't think this is the case on 335i's, but on the 135i's, the n55 midpipes are catless.

Bmwguy11 · 10-11-2011, 04:22 PM

Thanks for posting this. Nice to see a solid dyno comparison for this. I am giving serious consideration to DP's and FMIC in the future to go with my DCI/tune.

Skydive · 10-11-2011, 05:45 PM

Aside from power, I suspect the greater good would be turbocharger longevity.

bigdnno98 · 10-11-2011, 06:24 PM

Quote:

Originally Posted by LAE92

Sorry to thread jack...just wondering...if I have a stock TBE and replaced ONLY the DPs to 3" catless DPs (AR in my case) would there be a noticeable amount of smoke coming out of the exhaust during idle, half throttle, or WOT? I am hoping the secondary cats would eliminate most of it.

I'll let you know next week. I'm putting my dp on and will be running stock exhaust otherwise. Will have FBO minus exhaust with cobb stage 2 FMIC.

DaFish · 10-11-2011, 07:42 PM

Quote:

Originally Posted by GetSomeE92

Good stuff. I'll keep an eye out for it.

I don't want any exhaust smell, though. I feel that cheapens the car. I'd have to see someone's car that has this set-up to see what I think, I guess.

I felt the same way. There is no smell EXCEPT on cold starts if you are behind the car.... once it is warm, no smell

The gains are worth it, and really there isn't any smell. I was super sensitive to it as well, but I am very happy with what I have now.

AR Catless, with Stock back

Mike@N54Tuning.com · 10-11-2011, 08:35 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Stock intercooler, N55 mid pipe, stock muffler back exhaust + DCI + 93 octane.

Mike

Forgot to add that the car had a JB4 as well

Mike

I3ossman · 10-11-2011, 08:43 PM

Im doing ar catless combined with BMW performance exhaust. I'm trying to decide if I should hold off on the dp's until my cpo runs out but i'm not going to be able to lol.. this thread doesn't help!

If someone reading this in ne CT area knows the dp install very well and wants to help me I'll pay for your time, pm me. If it's easy enough I'll just put them on and swap them myself for dealer visits.

10-11-2011, 04:22 PM	#24
Bmwguy11 Lieutenant Colonel 1252 Rep 1,760 Posts Drives: 2016 YMB M3 Join Date: Aug 2011 Location: Wisconsin iTrader: (1)	Thanks for posting this. Nice to see a solid dyno comparison for this. I am giving serious consideration to DP's and FMIC in the future to go with my DCI/tune.
	Appreciate 0 Quote

10-11-2011, 05:45 PM	#25
Skydive First Lieutenant 5 Rep 300 Posts Drives: '07 E90 335i Join Date: Nov 2010 Location: Los Angeles, CA iTrader: (0)	Aside from power, I suspect the greater good would be turbocharger longevity. __________________ DD: 2007 BMW 335i Sedan Weekends: 2004 Porsche 911 C4S
	Appreciate 0 Quote

10-11-2011, 08:43 PM	#29
I3ossman Private First Class 7 Rep 139 Posts Drives: E92 335 Join Date: Jun 2011 Location: Ct iTrader: (0)	Im doing ar catless combined with BMW performance exhaust. I'm trying to decide if I should hold off on the dp's until my cpo runs out but i'm not going to be able to lol.. this thread doesn't help! If someone reading this in ne CT area knows the dp install very well and wants to help me I'll pay for your time, pm me. If it's easy enough I'll just put them on and swap them myself for dealer visits.
	Appreciate 0 Quote