thanks man! yea, thats a real sweet sound you got there and I want in on it

 

I get you a part # tomorrow just to make it quick and simple I am a salesman at a Fishers.

 

I run the 40 series.
Around town (2200rpm or less), or on the trial I love it.
On highway trips (2600+rpm) it gets old quick. Does not drone, but the volume is too much. It's loud enough you can forget about normal or even slightly raised conversation... and just shut your phone off, you'll never hear it ring.
If I were doing it over, I'd go 50 series.
Oh, I'm 41... that may have a lot to do with it as well .

 

I have the thrush welded muffler, same sound as a flowmaster and the same quality, for arond 40 bucks cheaper! I get comments on it all the time.

 

thanks for the input guys but im really liking what A Jeepr has got

Thanks A Jeepr!! I love keeping it simple

 

What tires/gears do you have? I think running 2600 rpm on the highway is the problem. Mine is same as yours around town, sounds good at 2000-2200 rpm. Around 2800-3K its pretty loud inside, but I run around 2100 rpm on the highway doing 70 and its quiet. I have 3.55 gears with 30's.

 

Ive got a 40 on my GC and it sounds great.

 

my dad actually works for flowmaster and i told him about your problem and he suggested that you go with the 50 series he says that it will give you a free enough flow while retaining the correct amount of back pressure without sufficient back pressure it wears hard on your valves an shortens engine life also when braking or letting of the pedal at higway speeds it will cause in apoping and that popping is your exhaust sucking air back into your exhaust manifold 40 series were originally designed for motors that have higher compression and exhaust pressure ratios than the 4.0 l have also the 40 series is too open of a design for me on the jeeps becase of its hollowed out sound it has when accelerating hard

 

WOW LOL

wears out valves...thats BS.... less back pressure the better, mufflers do nothing but restrict very slightly (high performance ones at least, stock ones are worse) and muffle sound to the way the consumer wants it. Longer the muffler (glass pack only) quieter the sound. More "chambers" more muffling.

BTW I work on race engines occasionally. Must run a manifold or header to keep the valves from bending. Need to get the pressure up and away from the valves. About 16 inches is enough tube length to prevent damage.

And the "popping" does NO DAMAGE TO THE ENGINE. All engines do this, its called backing down, unburned gas being burned in the hot tubing from heat. A controlled backfire. My v-twin lawn mower does that! So does my 4 banger Jeep engine in my '49. So does my dad's brand spanking new V8 Chevy P/U.....

Excuse me for ranting.

 

i would go with the super 44 it sounds so nice i wish i had one.

 

omg fellas, why pay that much. i have an adavanced auto thrush turbo muffler and custom exhaust and it all cost me 60 bucks from the local muffler guy and it was cut off at the header. just try the thrush muffler, the closer it is to the engine the louder it will be. keep n eye out for sum pics of it. it ends right before the rear end.

 

hey can I get that part number, please?

 

Flowmaster 40

 

xlerator VX series muffler

part #: VX2442

there is 1 left at the main warehouse. I have done a lost sale on it and more will be in stock in a few months. but go ahead and order it at your local Fishers and get the last one before its gone. my cost was $45 but im an employee....

good luck

 

there are a few different ones different part # but the VX2442 is the only one that is a direct fit. line code for these mufflers is 630 is they ask...