any motor that you give an increase to volume of air coming in and such will see a nice increase in throttle response horsepower and if you stay out of it gas mileage

 

62mm is too big for a stock Cherokee. $229 is kind of spendy when you can have the stock Throttle Body bored to 60mm for $75-100 at a shop or do it yourself for about $15. 60mm is perfect with a K&N type filter and a cat-back exhaust. You need these plus a header and some head work to put in a 62mm TB.

A bored Throttle Body on a stock engine has very little benefit.

 

actually i'm pretty sure the hole in the manifold is 62mm. The bottom of stock TBs are usually bored to 60mm because that is what size the butterfly and top of the TB is.

But I agree you won't get a benefit from a 62mm unless you upgrade the head and exhaust header as well

 

well actually i have a pace setter header ( i know not the best but i learned) and i have 2.5 inch piping from the header back with flowmaster muffler... so thats not a problem. thats what you meant right? and i was planning on getting an air raid intake and throttle body spacer as well..

 

Been running a PS Header for a year, no problems. Had it Ceramic coated by a local shop though.

You can go this route, Leigh Performance Machine

 

Boring the TB some good info here.

 

I have used Leigh Performance Machine throttle bodies on 2 of my Jeeps and am ordering a third for a hunting Jeep I'm building up for my son-in-law. $90 exchange for 60mm. Not just bored either. Bigger butterfly, too. Good bang for the buck.

 

the cheaper way is def the way I'll be taking lol I can bore mine out myself..

 

I do however have a header and exhaust on mine plus a honda s2000 filter for more air flow and soon enough I'll be putting on a snorkel

 

I would just make sure the factory TB is clean and leave it stock. I don't believe it adds any value for the money.

I would upgrade to a set of 4 nozzle fuel injectors from a Neon if you have some money burning a hole in your pocket.

 

A 98+ intake alone would be better than a bored TB just for the sole fact that newer intakes have a better belt tension design that take about 2 mins to remove the belt. That alone with justify the price of the intake if you like tinkering with the jeep. plus i think it gives the 4.0 better throttle response and better power with a header and exhaust system, ran it without a header and it lost low end power

 

sweet, thanks guys, i think im ganna go with the Leigh Performance Machine throttle body after i get my differential fixed though

 

You won't regret it. He usually has units on the shelf he can send you and then you send him your old one. No downtime.