Saddened after going catless! HELP!!

Jam335iCan · 05-21-2015, 09:09 PM

Recently installed catless downpipes from N54Tuning and went ahead with deleting the secondary cats. I also have Magnaflow mufflers in place. I now experience a snarling sound after a cold start and at the beginning to middle rev range of each gear. It's not a droning sound but a distinctive snarl. Has anyone had a similar experience?

Tiago@VRSF · 05-21-2015, 09:16 PM

Sounds like you may have an exhaust leak.

zeeth2800 · 05-21-2015, 09:49 PM

Yep I have the same thing.
I currently have catless DPs, N55 mid, and a muffler delete in the back and there is a really tiny rasp that happens on start up and when driving around at 2500-3000rpm in heavy load.
I am installing some resonators in the next week or so and hopefully that will quieten the noise down a bit.

Without a resonated mid pipe I am seeing this complaint A LOT.

mike@x-ph.com · 05-21-2015, 10:28 PM

i would check for a leak

Mike@N54Tuning.com · 05-22-2015, 05:53 PM

Quote:

Originally Posted by zeeth2800

Yep I have the same thing.
I currently have catless DPs, N55 mid, and a muffler delete in the back and there is a really tiny rasp that happens on start up and when driving around at 2500-3000rpm in heavy load.
I am installing some resonators in the next week or so and hopefully that will quieten the noise down a bit.

Without a resonated mid pipe I am seeing this complaint A LOT.

+1 a resonator will most likely cure the problem but like Tiago mentioned check for exhaust leak at all the joints and the DP to catback interface. Make sure the gaskets are sound and true all around.

Mike

Mike@N54Tuning.com · 05-22-2015, 05:54 PM

Quote:

Originally Posted by Jam335iCan

Recently installed catless downpipes from N54Tuning and went ahead with deleting the secondary cats. I also have Magnaflow mufflers in place. I now experience a snarling sound after a cold start and at the beginning to middle rev range of each gear. It's not a droning sound but a distinctive snarl. Has anyone had a similar experience?

Also did you do this all at once? Whats the last thing you did to the car's exhaust.

Mike

Fundguy1 · 05-22-2015, 05:58 PM

Leak it sounds like to me too

05-21-2015, 09:09 PM	#1
Jam335iCan Enlisted Member 3 Rep 37 Posts Drives: 2011 135i Join Date: Mar 2015 Location: Toronto, Ontario, Canada iTrader: (0)	Saddened after going catless! HELP!! Recently installed catless downpipes from N54Tuning and went ahead with deleting the secondary cats. I also have Magnaflow mufflers in place. I now experience a snarling sound after a cold start and at the beginning to middle rev range of each gear. It's not a droning sound but a distinctive snarl. Has anyone had a similar experience?
	Appreciate 0 Tweet Quote

05-21-2015, 09:16 PM	#2
Tiago@VRSF 2097 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Sounds like you may have an exhaust leak.
	Appreciate 0 Quote

05-21-2015, 09:49 PM	#3
zeeth2800 Private First Class 37 Rep 183 Posts Drives: 08 135i, 89 M3 Join Date: Oct 2013 Location: Corvallis, OR iTrader: (0)	Yep I have the same thing. I currently have catless DPs, N55 mid, and a muffler delete in the back and there is a really tiny rasp that happens on start up and when driving around at 2500-3000rpm in heavy load. I am installing some resonators in the next week or so and hopefully that will quieten the noise down a bit. Without a resonated mid pipe I am seeing this complaint A LOT. __________________ 2008 135i SGM 6-Speed l AD Engineering ST 6262BB l MHD Tuned l MAXBoost/N20 Map l GFB electronic boost controller l Spec 2+ l Walbro 450 LPFP l VRSF 7" FMIC l VRSF CP l Tial BOV l BMR 3.5" Exhaust l BMS Catch Can l RB pcv l
	Appreciate 0 Quote

05-21-2015, 10:28 PM	#4
mike@x-ph.com BimmerPost Supporting Vendor 24502 Rep 191,503 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	i would check for a leak __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
	Appreciate 0 Quote

05-22-2015, 05:58 PM	#7
Fundguy1 Major General 2036 Rep 8,339 Posts Drives: 335 e93 Join Date: Aug 2014 Location: Orlando, fl iTrader: (0)	Leak it sounds like to me too
	Appreciate 0 Quote