Stock Exhaust w/ catless DP's

Hallandale E92 · 09-24-2007, 06:32 PM

Anyone have catless downpipes and kept the rest of their exhaust stock.?

billspreston · 09-24-2007, 07:25 PM

I would be interested to hear this as well...

Hallandale E92 · 09-24-2007, 09:33 PM

Bump...

sambonator · 09-24-2007, 09:47 PM

I think Charlie has done that with Riss Racing downpipes (test model).

Hallandale E92 · 09-24-2007, 09:49 PM

There any videos

oddjob2021 · 09-24-2007, 10:09 PM

when i recieve/install mine my set-up will be this way, just be patient

335iheLLraiseR · 09-24-2007, 11:28 PM

i think there is someone here in s. fla that did that....hmm...not too sure though...i try to search screen name ends in psu something

335iheLLraiseR · 09-24-2007, 11:35 PM

nevermind...they were catted Dps.....

http://www.e90post.com/forums/showth...ighlight=fedex

black b5 · 09-24-2007, 11:48 PM

Quote:

Originally Posted by Hallandale E92

Anyone have catless downpipes and kept the rest of their exhaust stock.?

that is my intended set-up once RR pipes hit the streets.

i love that sound of the exhaust stock and even better with vishnu software.

hope is sounds a few decibles louder than that^^^^

Cornhusker · 09-25-2007, 12:02 PM

I think this is what LeftCoastMan has done. Hit him up. It's not a bad idea...really.....considering the problems walkedu has had with the bad sound since removing all the restrictive stuff.

Walked U · 09-25-2007, 12:13 PM

Quote:

Originally Posted by Cornhusker

I think this is what LeftCoastMan has done. Hit him up. It's not a bad idea...really.....considering the problems walkedu has had with the bad sound since removing all the restrictive stuff.

Well I did straight pipes with no joining parts. Its really the esinemann mufflers I think. When I had no restrictions with the magna flows. It sounded really droney inside the cabin. Kinda sounded farty but wasnt as all that bad with the metallic sound up top.

Some good high flows should help. Maybe even the euro spec downpipes might help. I know on the m3 that the euro cats are a lot less restrictive. So maybe its the same with the 335i. If I get in the mood to mess around with the exhaust again Ill try the euro dp's but as for right now Im content until anthony / adam ask me to try out the final product RR DP's.

leftcoastman · 09-25-2007, 12:40 PM

Quote:

Originally Posted by Cornhusker

I think this is what LeftCoastMan has done. Hit him up. It's not a bad idea...really.....considering the problems walkedu has had with the bad sound since removing all the restrictive stuff.

Yup - high flow catted DPs stock exhaust with secondary cats. Whistles a bit at low rpm but nothing too annoying. It also burbles a bit on decel, but I haven't seen flames shoot out the back yet, lol.

Keep in mind I only care about performance and actually prefer not being any louder.

Spoolup is much faster. In fact, I pulled some data from the PROcede pre/post and the slope of the boost vs. rpm curve is 2x steeper than before, implying spoolup that is twice as fast.

retrodrive · 09-25-2007, 01:26 PM

Quote:

Originally Posted by Walked U

Maybe even the euro spec downpipes might help. I know on the m3 that the euro cats are a lot less restrictive. So maybe its the same with the 335i.

I would really like to find out this for a fact. If euros flow better, maybe I won't even need aftermarket downpipes.

leftcoastman · 09-25-2007, 02:00 PM

Quote:

Originally Posted by xedeboy

At what RPM range are you testing this?

4th gear pull - same location, similar temps, sweeping from 1300rpm to 4000 rpm.

The area of the boost curve that is of interest is the initial spoolup, so the slope is measured from 1300 to ~2700rpm

leftcoastman · 09-25-2007, 02:09 PM

Quote:

Originally Posted by xedeboy

Very cool, this is the first actual confirmation of quicker spool with downpipes that I've seen. No plans to remove the secondary cats?

I can definitely feel the faster spoolup - but wanted to objectively measure to make sure I wasn't fooling myself b/c I paid so much for them!

No plans to remove 2nd cats. (1) Don't want more noise (2) I want my kids to be able to take a deep breath without hacking up a lung.

Steage · 09-25-2007, 04:10 PM

Quote:

Originally Posted by leftcoastman

I can definitely feel the faster spoolup - but wanted to objectively measure to make sure I wasn't fooling myself b/c I paid so much for them!

So what DP's do you have?

Walked U · 09-25-2007, 07:06 PM

High flows FTMTW. Sorry im just excited that I actually got the car to sound good for a change.

http://www.e90post.com/forums/showth...t=84679&page=8

leftcoastman · 09-25-2007, 07:14 PM

Quote:

Originally Posted by JeremyDS

So what DP's do you have?

UR

itsbrokeagain · 09-25-2007, 08:51 PM

Quote:

Originally Posted by leftcoastman

but I haven't seen flames shoot out the back yet

LOL I would love to see a 335 shooting flames, but with all that technology (i.e. Direct Injection) and the fact it has a MAP sensor and not a MAF I think we would have a bit of a hard time trying to get it to do something...

DamnitDavid · 09-25-2007, 09:11 PM

335i with a cutout sounds cool

AW335TT · 09-26-2007, 04:49 AM

I have my secondary cats and mufflers completely removed..only have primary cats on right now. Ill try to get a sound clip soon.

09-24-2007, 06:32 PM	#1
Hallandale E92 Lieutenant 36 Rep 587 Posts Drives: 2007 335i Titanium Silver Join Date: Apr 2007 Location: Hallandale, Florida iTrader: (2)	Stock Exhaust w/ catless DP's Anyone have catless downpipes and kept the rest of their exhaust stock.? __________________ ON Order: Crimson on Coral E92 335i RIP: Totaled 2007 335i Titanium Silver/ Coral Red : VIP Tuning Custom tune, VIP Tuning Intake, VIP Tuning charge pipes, VIP Tuning BOV, UR cat-less down pipes, OEM aero lip, OEM aero rear valence, 19" Iforged Daytonas
	Appreciate 0 Tweet Quote

09-24-2007, 07:25 PM	#2
billspreston Colonel 345 Rep 2,252 Posts Drives: G87 Join Date: Jul 2005 Location: CA iTrader: (13)	I would be interested to hear this as well...
	Appreciate 0 Quote

09-24-2007, 09:33 PM	#3
Hallandale E92 Lieutenant 36 Rep 587 Posts Drives: 2007 335i Titanium Silver Join Date: Apr 2007 Location: Hallandale, Florida iTrader: (2)	Bump... __________________ ON Order: Crimson on Coral E92 335i RIP: Totaled 2007 335i Titanium Silver/ Coral Red : VIP Tuning Custom tune, VIP Tuning Intake, VIP Tuning charge pipes, VIP Tuning BOV, UR cat-less down pipes, OEM aero lip, OEM aero rear valence, 19" Iforged Daytonas
	Appreciate 0 Quote

09-24-2007, 09:47 PM	#4
sambonator Samtaro! 128 Rep 2,609 Posts Drives: 2014 F32 N55 Alpinweiß Join Date: May 2007 Location: Newport Beach, CA, USA iTrader: (7)	I think Charlie has done that with Riss Racing downpipes (test model).
	Appreciate 0 Quote

09-24-2007, 09:49 PM	#5
Hallandale E92 Lieutenant 36 Rep 587 Posts Drives: 2007 335i Titanium Silver Join Date: Apr 2007 Location: Hallandale, Florida iTrader: (2)	There any videos __________________ ON Order: Crimson on Coral E92 335i RIP: Totaled 2007 335i Titanium Silver/ Coral Red : VIP Tuning Custom tune, VIP Tuning Intake, VIP Tuning charge pipes, VIP Tuning BOV, UR cat-less down pipes, OEM aero lip, OEM aero rear valence, 19" Iforged Daytonas
	Appreciate 0 Quote

09-24-2007, 10:09 PM	#6
oddjob2021 ASR Turbos+LSD+Meth= :D 79 Rep 1,517 Posts Drives: E92 335i Join Date: May 2007 Location: Miami, FL iTrader: (0) Garage List 2007 E92 335i [0.00]	when i recieve/install mine my set-up will be this way, just be patient __________________ 2007 335i Coupe Mods: Check the Garage
	Appreciate 0 Quote

09-25-2007, 12:02 PM	#10
Cornhusker Lieutenant 49 Rep 403 Posts Drives: 335i Join Date: Jan 2007 Location: Nebraska iTrader: (1)	I think this is what LeftCoastMan has done. Hit him up. It's not a bad idea...really.....considering the problems walkedu has had with the bad sound since removing all the restrictive stuff.
	Appreciate 0 Quote

09-25-2007, 07:06 PM	#17
Walked U Brigadier General 186 Rep 3,125 Posts Drives: Too many to list Join Date: Nov 2006 Location: USA iTrader: (5)	High flows FTMTW. Sorry im just excited that I actually got the car to sound good for a change. http://www.e90post.com/forums/showth...t=84679&page=8 __________________ Previous - E90 335i, E82 135i, E89 Z4 3.5SI, Range Rover S/C, Ultra White RCF, Maserati Granturismo Current Lexus: SMG LC500 performance package Porsche:1973 911E Ferrari 575 SA, 458 Italia
	Appreciate 0 Quote

09-25-2007, 09:11 PM	#20
DamnitDavid Chocolate Wasted 24/7 365 2 Rep 39 Posts Drives: '10 GT-R and '09 M3 AW Join Date: Dec 2006 Location: Carson, CA iTrader: (0)	335i with a cutout sounds cool __________________ '10 Nissan GT-R\| Tuned '10 Honda S2000\|DD with 400whp '09 M3 AW\|Not Stock
	Appreciate 0 Quote

09-26-2007, 04:49 AM	#21
AW335TT Major 622 Rep 1,420 Posts Drives: a car Join Date: Feb 2007 Location: North Hollywood, CA iTrader: (0)	I have my secondary cats and mufflers completely removed..only have primary cats on right now. Ill try to get a sound clip soon. __________________
	Appreciate 0 Quote