You should have stayed with the Power Strokes for great sound. I am running no cat with a 2.5 in Thrush muffler from local parts store, this muffler was ten sizes smaller than factory and it fits snuggly under the jeep. I have not finished it all up yet pretty much because i like how it is now. I was running no cat or muffler that was crazy loud and sounded like crap. My set up is simple galvanized pipe from down pipe to new muffler and i have it dumping out in front of rear axle. Not the greatest but i like it. Oh and another thing these little jeeps will never sound like a Power Stroke.

If you want to mess with the exhaust system in hopes of more power or something IMHO the best thing to do is replace the stock muffler with something like a Magnaflow #12226 which IIRC requires a bit of added pipe as it's shorter than OEM. Then save all those $s you did not spend on pipe that IMHO won't do much to buy a GDE tune which will do a lot for power, economy, and engine life.

I think that those $500 spent for the gde tune were the best $500 I had spent for this Jeep ever. Just my opinion . Took a look at the oil after almost 1000 miles, looks almost like a gasser. Engine sounds so much cleaner, better response/acceleration, better mileage. IMO it's a must for this engine.

I was not saying that it wasn't a good invesemt. Again I guess we are a bit off topic. On a side note what tune is preferred? I've notice two different Eco tunes and the hot tune? What supporting mods should be performed?