austinjoe13

You guys are spending way too much on cats IMO.

http://performance-curve.com/thunderbolt-spincat.aspx

Someone asked about a better sounding cat, better flow equals a rawer, closer to straight pipe sound. This is what I have, and it sounded great before I put my muffler on

http://performance-curve.com/thunder...-metallic.aspx

Truth1230

I have a '99 Grand Cherokee 4.0L. I am looking to put on a cat back muffler to relieve back pressure...and to sound better.

I don't want a real aggressive sounding muffler...just rumbly

AND...I am looking for an economical soultion, as well.

Any help would be greatly appreciated.

Thanks

Truth1230

I have a '99 Grand Cherokee 4.0L.

I am looking to put a cat back, bolt on muffler to relieve some back pressure...and so it sounds rumbly

I don't want anything really aggressive sounding.

Something economical, as well.

Any help or suggestions would be appreciated.

Thanks!

chpalmer

Pacesetter- modified to miss the (stock lift) driveshaft.

Hi flow cat

Rusty's exhaust with 50 series. (daily driver)

Love it!


2.5" all the way out.

D PHILLY

What would a delta 50 series sound like with everything else completely stock? Would their even be a change? Thanks guys!

my89xj

It would be a little louder

xj guy

So my exhaust has holes in it, it is loose, and well lets just say it is DONEZO...

I brought my XJ back for a recal on the PCM and it turns out my CAT is bad and will be replaced at the cost of the dealership

My question is, when I go to replace everything from the Cat Back can I add 2.5 pipping then? Or does the cat I get have to have a 2.5 fitting on the end? I don't know where the size reduction starts. It is 2.5" all the way to the cat correct?

And don't worry, I'll do my research on which kind of muffler to get. I don't want to be "that guy" and have every one else tell me what to get.

my89xj

Its 2.25 once it hits the cat. Let them replace the cat, you can get a size reducer then get a 2.5 muffler and tailpipe

xj guy

Okay I think I see what you are saying. So is the header 2.25 all the way to the cat and the cat back is 2.25 as well? SO once I get all of my gear together just be sure to get a reducer to put after the cat?

ThatPurpleXJ

The cat outlet is 2.25 if you buy a cat back exhaust with a 2.5 diameter you have to get a reducer from a 2.25 to 2.5. If not then don't worry about it.

xj guy

Makes sense. Now is there any benefit of going to the 2.5 cat back( I know it is our optimal size) if everything before that is 2.25? Or is that how most of your set ups are?

my89xj

Better flow is always better

xj guy

Noted. And I guess If I ever want to go 2.5 from the headers down I already have the pipes to do it!

As far as buying all of my parts, is it Cheaper to buy all of my pipping separate pick a muffler I like and put it all together myself? Or should I just be looking for an entire kit? I'm trying to save some $$$

ThatPurpleXJ

Performancecurve.com is probably the cheapest. You get a 2.5 catback with your choice of muffler for $115. Then just get the coupler or have someone weld it up

xj guy

I have a couple of buddies who can do some welding, so maybe I'll ask if they can give me hand. And thanks for the site! I'll check it out.

I'm excited to have a noise coming from my xj that isn't creaks and cracks or the rambunctious sound of a stock muffler with holes in it... And yes I did just successfully use the word rambunctious.