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post #1 of 10 Old 12-04-2007, 02:20 PM Thread Starter
 
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Flow Master 40 question

Ok, So it looks like I'm going to take some advice I've seen here and put on a flowmaster 40 or super 44 offroad, in place of my stock muffler on my '08 jk 4dr. Anybody know how much hp/torque gain to expect? Also, thought not my primary concern, mpg increases? And lastly, I'm not planing on relocating it, so it'll still be pretty far behind me-how loud should I expect the interior noise to be?

Last edited by Xyster; 12-04-2007 at 02:38 PM.
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post #2 of 10 Old 12-04-2007, 06:24 PM
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Dunno how loud it will be for sure, but you could fab a bigger heat sheild and mount it up there, I would assume that it would help keep the drone out.

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post #3 of 10 Old 12-04-2007, 06:32 PM Thread Starter
 
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Any idea on hp gains?
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post #4 of 10 Old 12-04-2007, 06:33 PM Thread Starter
 
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Btw, hats off to all military, you do us proud.
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post #5 of 10 Old 12-04-2007, 08:07 PM
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No idea on hp gains but I'm sure it will be but it will surely not open it up so much to where you lose. Especially using stock piping.

and thanks!

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post #6 of 10 Old 12-05-2007, 07:20 AM
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I doubt you'll pickup up that much power or mpg, most probably not enough to feel anyway. FWIW An intake will improve throttle response noticeably.

Can't speak for JK as I haven't heard one, but a 40 is usually pretty loud, and I wouldn't expect it to be any different on the JK.
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post #7 of 10 Old 12-05-2007, 09:35 AM Thread Starter
 
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I've already put in an airaid cai, which definitley made a difference in the low end rpms, and I have an airaid tb spacer on the way. It was free, so what the hay. I know the most noticible improvement I could make is probably to regear from the 3.73s that came with the auto, to 4.88 or 5.13 since I put the 35" bfg's on. But, that's gonna come later, after the holidays are done draining me!
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post #8 of 10 Old 12-05-2007, 12:11 PM
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I read on another forum that Flowmaster has recommended a 50 series for our motor. They said it's a better match than the 40. I would write them to confirm. Seems like the backpressure will either make or break the 3.8.

/jl

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post #9 of 10 Old 12-05-2007, 05:01 PM Thread Starter
 
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Well, made my decision and put down a deposit today @ my local shop-going with the super 44 offroad. It'll be in on the 15th.
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post #10 of 10 Old 12-05-2007, 05:42 PM
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I'm ordering a Flowmaster 50 series n heat shield tomorrow
I'm prob gonna pull my muffler and have a shop bend me up a tail pipe and be noisy for awhile till the muffler comes in and I get a chance to install it
I like being obnoxious!

I had electric cutouts on my Harley Truck and they were open 90% of the time


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