Whats a good fairly priced set up?
In my opinion, the best intake for a 4.0 that you can get would be the intake manifold from a 2000+ I6. It'll give you a lot more air & is designed to give a lot less internal turbulence and all this gives you some real bolt-on horsepower. Much of the other stuff on the market is nothing more than "bling" - a shiny pipe with a visible filter, and these won't give you any measurable power increase.
Is this a direct bolt up? And what about exhaust.... i like how my stock set up is for mud, but want power and some rumble.... my stock intake mod was putting a 90deg exhaust pipe strait up to about 2 inches beloew the hood from the hole in the bottom of air box, sealed it off and put a piece of "cat" prefilter on the top to keep debrie out
Originally Posted by Alfons View Post
ALL you guys that are looking for more performance from a 4.0. tear down the engine and blue print it. You might gain a little from that. Polish your intake runners, port the heads and intake , exhaust. You might gain a few extra ponies from that, change injectors, Clean up what the factory did not do to make the engine to it's max power. Then when you get all said and done you have spent better than 2 grand on the motor or more. You still have a 4.0 that might run a little smoother have just a touch more power and a little better torque curve.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat View Post
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