in the throttle body?

Beyond improving over the stock air-filter, unless you've upgraded the exhaust, ported the head/intake manifold or have a stroker doing other upgrades won't necessarily make much if any difference in performance.

 

Well the exhaust is 2.5 inches from the cat back. I would love to stroke it out, but I don't have the money or the ability to right now.

 

and no not the hole from the throttle body the actual hole that the stock air-box sucks through.

 

behind the headlight right?

 

ya, I just figured it would not hurt to have a little more air flow to the throttle body.

 

absolutely, I'm planning a well built air intake with heat shield in the future.

 

The real constrictions in the exhaust are the stock header and the down pipe(notorious for being crimped and inadequate from the factory)

Oh, it'll help a little bit.

Seeing as airboxes are cheap and plentiful, go for it.

 

That's not true at all. The stock exhaust manifold is actually pretty well designed as far as flow is concerned.

 

I don't agree with this because they do cut flow by all collecting into a single pipe and the small diameter. Also the down pipe
does have a kink or dent in it for no reason. Nobody had been able to figure out why it's there but we do know it restricts the flow.

 

thanks a bunch man...id just lock mine permanent,but i dont want all those parts workin all the time (on the road) if they aint gotta...so i think this the best way to go for me!
gonna start parts collecting this week!

 

I disagree.

the type of exhaust that flows the best will have the cylinders paired up by 180 degrees in crank timing to help match-up exhaust pulses and for low-reving engines like the AMC 242 the tubes would be nice and long to help out the torque band.

Incase you haven't noticed, the stock manifolds do neither

 

that does make sense, I have always heard about the donut gasket leaking from the factory as well.

 

That kink is there to make room for the drive shaft as it cycles thru the suspension travel. When I first got my XJ I didnt notice any interference until I installed my lift.

 

Why doesn't it work?

 

Ah ha thanks I always wondered lol