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Old 05-10-2007, 08:04 AM   #1
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UsmcScott's Avatar
Join Date: Jun 2006
Location: Maryland
Default Delete the Middle MUFFLER & Replace with STRAIGHT Pipe

During conversations about streamlining the undercarriage, the drag created by the middle muffler was mentioned as being significant.

So my crazy question of the day is, what would happen if I eliminate the middle muffler altogether and replace it with a piece of straight pipe?

Pros, Cons, Consequences ???????
240 Wagon '92 148k NA at

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Old 05-10-2007, 08:31 AM   #2
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Join Date: Aug 2005
Location: Fairport, NY

The "middle muffler" is just a resonator, not a muffler. If you remove it you will get a little better tone and a very slight increase in power.
John Werner
* 1993 965 * 1994 964 * 2004 Honda Odyssey *
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Old 05-10-2007, 08:54 AM   #3
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Join Date: Mar 2004
Location: Vancouver, WA

It will get slightly louder but shouldn't be anything to complain about. iPd's sport exhaust system is exactly this, just a rear muffler like a stock 240 turbo exhaust setup.
1. 86 244DL- 1st car & Owned for 15 years, 25mm sways, iPd springs/fronts cut 1 coil, HDs, 2.25" exhaust, b-cam, EZK 117K, M47 swap, 100a intake side alt, No PS/AC
2. 93 945 Turbo - IPD sways, 3" turboback exhaust, intake, accumulator mod

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Old 05-10-2007, 10:49 AM   #4
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Join Date: Jun 2002
Location: S NJ, a suburb of Phila.
Default muffler

You can eliminate it and it'll sound a bit better. Sometimes though, you get a drone resonance between 2k - 3k rpms. An exhaust tip with a resonator in it will flow better and cancel out that drone if you have it. If you don't have the drone resonance then one muffler will be fine.
1982 242 turbo. 339k miles. Lots of good changes.
1993 245 Classic, 415k miles, enem V15. 5spd. IPD bars and chassis braces. Simons sport exhaust from Scandix. chipped ezk. Been a good road warrior.
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Old 05-10-2007, 11:26 AM   #5
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Last edited by fivealive; 04-23-2017 at 01:23 PM..
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Old 05-10-2007, 12:39 PM   #6
2.1L 2.3L 2.8L 2.8L
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Join Date: Jun 2004
Location: Edmonds, WA

I only have a rear muffler, has been that way since I bought the car. Actually it had a glasspack on it when I bought it. Loud. Too loud. Better with an actual muffler back there.
It will be louder without the middle resonator, but not a lot louder than stock. It isn't truck with no mufflers loud or fart can loud. Idle is just a little deeper, and it is a bit louder around 3-4k rpm. You won't be frightening pedestrians.

We also removed the center resonator from my sister's old diesel mercedes (for economic reasons). That actually didn't make it much louder than stock, I didn't really notice it.

Originally Posted by dl242gt View Post
Sometimes though, you get a drone resonance between 2k - 3k rpms.
Yes yes yes. Around 3k rpm my car drones rather loudly. With the glasspack on it was unbearable.

Give it a shot. Can't hurt anything that I know of.
1981 242 Turbo |1996 850R |1980 Coupé (Project)
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