Normal exhaust sounds or not?

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Apr 13, 2005 | 11:05 AM

ArmyVette

Thread Starter

Le Mans Master

Joined: Sep 2003

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From: Just a little outside San Antonio, Texas

Normal exhaust sounds or not?

When I traded my A4 coupe for a MN6 vert just over a month ago, I had my Corsa Indy Pace exhaust swapped over to the vert.

With the A4, when I slowed the car down, there didn't seem to be any significant noise coming out of the exhaust. Just seemed to have a nice rumble.

With the MN6, it almost sounds like the car backfires a bit when it is decelerating (under engine compression; not from stepping on the brakes). It is a rather sharp sound, gets less loud as the engine returns to near idle, but doesn't sound like a normal backfire that we have all heard from cars from time to time.

Is this normal for a MN6 or do you think something might be wrong engine-wise?

(If you need more info, please ask.)

Apr 13, 2005 | 04:25 PM

vetdude

Race Director

Joined: Jun 2002

Posts: 12,198

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From: Columbia MD

"Bacckfiring" or "popping" is common with the aftermarket exhaust systems in these cars due to the improved flow. Replacing the factory "H" pipe with an x-pipe helps a little but I've had the backfiring from Corsa, B&B and GHL in our '99 MN6 coupe. Had to go back to a Z06 system to eliminate it. We have a B&B RT66 system with corsa x-pipe on our '02 A4 convertible and no backfiring or popping.

Apr 13, 2005 | 08:06 PM

happa

Safety Car

Joined: May 2004

Posts: 4,811

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From: Simpsonville SC

hes right

mine does it, cant wait till I get Longtubes and an X-pipe!

Apr 13, 2005 | 08:52 PM

John Cullen

Racer

Joined: Sep 2004

Posts: 428

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From: Smyrna Delaware

rumble

I just put on GHL's with x pipe and I get the crackle and pop slowing down . But not so bad I can't live with it,matter of fact I like it.

Apr 13, 2005 | 10:19 PM

ArmyVette

Thread Starter

Le Mans Master

Joined: Sep 2003

Posts: 6,386

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From: Just a little outside San Antonio, Texas

OK, then this sounds pretty normal. I have an X-pipe. I may be noticing it more because I running with the vert's top down most of the time.

Thanks, gang!

Apr 14, 2005 | 03:46 PM

nwdanner

Burning Brakes

Joined: Jan 2004

Posts: 896

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From: Overland Park KS

Quote:

Originally Posted by ArmyVette

OK, then this sounds pretty normal. I have an X-pipe. I may be noticing it more because I running with the vert's top down most of the time.

Thanks, gang!

It's completely normal. You don't have that behavior with an automatic because (unless forcably downshifted to a lower gear) the inherent design prevents the transmission from performing engine-assisted braking.

Either push in the clutch or downshift to lower gears when the engine RPMs drop to near idle (~1000rpm). Then you won't hear it any longer. I only use engine breaking when I want to "sound" my triumph of glory to losing opponents. And the Quad Borla Stingers and LGM LTs do that VERY nicely.

Last edited by nwdanner; Apr 14, 2005 at 03:54 PM.

Apr 14, 2005 | 04:21 PM

slverc5

Melting Slicks

Joined: Aug 2004

Posts: 2,879

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From: Plainfield Ill.

I have a A4 with OEM h-pipe and Borla Stingers, and I don't here any popping, in fact when slowing down, I will hear a slow low rumble. But I guess that's what nwdanner had mentioned already, will be getting an X-pipe soon , most likely mid to late summer.

Apr 14, 2005 | 04:41 PM

Gimmesum HP

Instructor

Joined: Nov 2002

Posts: 204

Likes: 0

From: Crowley TX

I've got lt's, an x-pipe, high flow cats and Borla stingers on my A4 and I can make it pop by downshifting but it won't usually do it under normal driving conditions. The x-pipe did help to tone it down.