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View Full Version : 3in Exhaust on a 3.7?



cabledog25
09-28-2012, 11:28 AM
Ok well im thinking about changing out my exhaust to 3in from the cat back. What kind of Performance gains would i get out of it on my 3.7. Is it even worth it?

07JeepXK
09-29-2012, 06:34 PM
Every bit helps!

Sal-XK
09-29-2012, 09:08 PM
3" on a 3.7L I think is a waste of time and money IMO

cabledog25
09-30-2012, 01:38 AM
Every bit helps!

You know what kind of gains i would get? if any at all.

07JeepXK
09-30-2012, 11:43 AM
Like sal said, on a 3.7 for the cost its probably not worth it for the minimal gain your going to get. I would just install a high flow muffler and save yourself some $. To really get anything out of it you would need to get an intake and tuner also. But your talking a lot of money. If you really want a good gain just do a gear swap and install some 3.73's. that will still run you about a grand or more

Matt
09-30-2012, 12:01 PM
Honestly, I haven't heard an exhaust on a 6 cylinder that I thought sounded good.... including my 4.0 SOHC ford and 4.0 I6 cherokee. My honest opinion is that performance gains would be minimal, and sound improvement is questionable (I haven't heard a 3.7L WK/XK with exhaust yet).

I know you have other mods planned. SO..... I recommend saving exhaust for last.

cabledog25
09-30-2012, 07:06 PM
Like sal said, on a 3.7 for the cost its probably not worth it for the minimal gain your going to get. I would just install a high flow muffler and save yourself some $. To really get anything out of it you would need to get an intake and tuner also. But your talking a lot of money. If you really want a good gain just do a gear swap and install some 3.73's. that will still run you about a grand or more

Well ive already got a flowmaster 44 and its sounds great, i was just thinking about it and figured yall were the best people to ask these questions to. and ive got alot of mods coming soon in about 6 months and some of the mods do include an intake, tuner and also putting 4.10 gears in the rear end since in only got a 2wd. but thanks for the advise guys.

07JeepXK
10-01-2012, 09:25 AM
If you already have a flowmaster muffler your not going to see any more gain. Get those 4.10's in there and you'll be set

cabledog25
10-01-2012, 09:53 AM
alright thanks man

RenoReno2
10-06-2012, 09:30 PM
You would probably lose horsepower because of the loss of backpressure

thance
10-09-2012, 11:42 AM
You would probably lose horsepower because of the loss of backpressure

That's my thought. You would lose torque in the low and mid range and quite possibly not gain any HP at the top end.

RenoReno2
10-10-2012, 04:49 PM
Yeah my understanding is your better off being too restrictive then too large.