About to redo My whole exhaust and have a few questions! Help Me out

To start will I have a 1988 renix 4.0 jeep Comanche, and the exhaust is rusted out completely. I know my only choice for a aftermarkets header is the pace setter so Im going to go with that first of all.

Also Im going to put a cheap high flow cat performance curve on it too.

As for the muffler I dont know what to go with, I want a deep sound. I want it to be loud with out being super loud. From the videos I have seen on you tube the flowmaster is a bit to high pitched and the magnaflow sounds deeper. what would yall suggest? and what series of what model muffler, If you could attach sound links to those that u suggest on the older 4.0, so I can see what it will sound like that would be AWESOME!

ANOTHER QUESTION.... what is the stock exhaust size? and should I run bigger pipe from the header than stock? would I notice anything from this? (sound,power,torque...)


I think thats about all I have guys, please let me know your input.

no body.....?

performance curve also has a couple of cat-back options. I prefer magnaflow. Can pick up muffler only for around 50$ on amazon.
I would go with a custom, mandrel-bent downpipe (with a flex joint if you choose, will help prevent f'd exhaust since its pretty much solid to the engine) in the 2.5" flavor,

I just added a Thrush Glass Pack, and it sounds better than stock. Very low back pressure, and lots of ground clearance too...

I did a MagnaFlow cat and Flowmaster 50 cat back from either Rustys or IRO, don't remember, but all 2.5".

what did it run you?

JaVeLiN said:

I just added a Thrush Glass Pack, and it sounds better than stock. Very low back pressure, and lots of ground clearance too...

Click to expand...

I dont want a glasspack

Hiflow cat from summit and dynomax kit would be cheapest/sound the best. I have the hiflow ss cat from summit with a borla catback, nice mellow tone, 304 stainless but cost a decent amount.

Im running a glasspack as well.. i needed clearance for my DS

I ended up just ordering my exhaust tonight, I went till a pacesetter header, high flow 2.5 inch cat and a 2.5 inch inlet magnaflow..... I hope it turns out goo, and Im wondering if I might even be able to see a HP increase from it. It all Came out to like $319

did a thrush with a down turn an it loud as crap. but it cheap and sounds good

like I said I didnt want a glasspack

My thrush turbo muffler in place of my beat up stock muffler is almost as quiet at idle, it has a nice beefy tone at cruising RPM, and it roars when you open it up, but I wouldn't say it's loud. I really like it.

Mine's on a 2000 if that matters.