3.7 Exhaust - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 13 (permalink) Old 07-01-2007, 02:49 AM Thread Starter
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3.7 Exhaust

hey wondering if there are any members that upgraded their 3.7 exhaust for better performance?? any other 3.7 performance mods out there? Also can you get performance gains with just a muffler or is that stupid marketing?

thanks!

Jon
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Last edited by Command This.; 07-04-2007 at 03:25 AM.
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post #2 of 13 (permalink) Old 07-13-2007, 06:09 AM
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Re: 3.7 Exhaust

I looked at my muffler the other day and I was shocked.
That bitch is the size of a coffin

Im sure I can find a aftermarket with better breathing and smaller size.
Gee'z....I only have a 3.7L

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post #3 of 13 (permalink) Old 07-13-2007, 08:09 AM
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Re: 3.7 Exhaust

weight savings alone should show a gain!
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post #4 of 13 (permalink) Old 07-13-2007, 08:58 AM
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Re: 3.7 Exhaust

Any performance gain with just a muffler are going to be minimal at best. In fact, you may actually decrease your performance and fuel economy by going to a less restrictive muffler.

That said, I cut the coffin out and put in a Flowmaster 40 on my 4.7 and couldn't be happier. No seeming change in performance or economy, but it sounds a lot better.
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post #5 of 13 (permalink) Old 07-13-2007, 10:09 AM
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Re: 3.7 Exhaust

The best mod so for for the 3.7L is the K&N intake. There is a thread on this on this forum. I am sure a combination of both intake and exhaust mods would be a positive thing, but I haven't seen any aftermarket muffler for the 3.7L. I am sure a custom muffler shop might be able to figure something out though.
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post #6 of 13 (permalink) Old 09-15-2007, 08:34 PM
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My wife had a 06 Liberty with the K&N air filter, and a Flowmaster 60 series muffler installed. Really woke up the engine. Not to loud inside or outside the vehicle. She just traded it in for a 07 Commander Sport with the 3.7. We will probably do the same modifications as on the Liberty since its the same engine and powertrain. Just wish it had a lower gear ratio than it's current (too high) 3.07
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post #7 of 13 (permalink) Old 09-16-2007, 05:17 PM
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I'd be very interested in upgrading my exhaust (3.7L as well) let us know...
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post #8 of 13 (permalink) Old 09-17-2007, 10:51 AM
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Will this type of modification void the warranty??
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post #9 of 13 (permalink) Old 09-17-2007, 12:02 PM
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Quote:
Originally Posted by Command
Will this type of modification void the warranty??
It might "void" the warranty on the engine (modifications can not void the entire vehicle warranty, only the warranty on effected parts).

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post #10 of 13 (permalink) Old 09-17-2007, 12:15 PM
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I would only expect the exhaust change to void the warranty on the exhaust, not the engine.


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