SwampDonkeyXJ
NAXJA Forum User
- Location
- North Carolina
Hey guys, I have a 99 XJ (6" lift, 33x12.50, 4.10 gears, SYE, rock rails, Warn front diff cover, custom bumer with 9000lb winch, Rock Krawler steering system, and some other stuff...) I have been thinking about upgrading my exhaust system. I want to increase performance and hopefully gas mileage because mine sucks right now. (I swear I'm getting around 8mpg) I know better than to expect good gas mileage, but that's pretty bad. Anyway, I have a K&N cold air intake right now which I plan to modify into a snorkel eventually. I am thinking about getting a TB spacer, new manifold, high flow cat, and a new muffler. It would be nice to get a little deeper tone out of the 4.0 but I don't want it to be loud. I'm sure I should toss a new O2 sensor int here too. The engine is close to 116,000 miles right now. New plugs and wires might be a good idea too. I am considering the SeaFoam treatment also. I am looking for any suggestions on the best way to go for improved performance. I have seen recomendations for the Dynomax Super Turbo Exhaust I also constantly see advertisements on Jeep Forums for this manifold Has anyone given these products a try? Any recommendations would be greatly appreciated. Thanks guys.