Originally Posted by wilkinsglock5
really??? you didnt have to bore out your plenum or anything at all??? just bolt it on and go? no problems at all??
I know its an old thread but yes, i just dis the 4.0 TB switch to my 97 tj 2.5. I recently swapped out my muffler to a 30$ Thrush from Autozone and i have a "cold air intake" on as well. Definitely an increase in performance while going up hills and while cruising at 45 and hitting gas to pass. I jave the 30RH also (3 speed automatic?) I believe the stock 4.0 is 58mm and tapers, so a 60mm straight through might be. Little better too.