[jeepcreep]

2-1/2" High Flow Metallic Substrate Converter

2-1/2" High Flow Metallic Substrate Converter (about 20% better flow than the ceramics) $175.00
This is where I got mine :http://warpspeedperformance.com/jeep.htm
I had a muffler shop weld it on along with a Flowmaster delta 40 and it sounds sweet. I have the 5.2 though,not sure what a 4.0 would sound like.
I had a borla cat back on that i bought last June but it was too stock sounding so when my stock cat broke and started to clog my exhaust I decided to get a high flow cat and a Flowmaster muffler.
I still used the Borla tailpipe. The shop only charged me $60 .

 

[jeepcreep]

I have a 96 Grand Limited and in R.I. they don't have to put the sniffer in the tailpipe for a 96+ they just plug it int the computer under the dash and as long as your check engine light isn't on ,voila your good to go.
Besides if our going to go off roading you would want a metal substrate not a ceramic as it would be able to withstand more vibration and shock than a ceramic. when I received the high flow cat in the mail you could see right through it even at an angle. All you have to do when you call them is tell them the year make and model plus the engine and they will get you the correct high flow cat.