Not to mention the 340hp Q45:

Titanium valves, a silent-chain cam drive, a hydraulically driven cooling fan, continuously variable intake-valve timing, variable volume induction, and an electronic throttle.

0-60 in 5.9 sec.

You could use it to tow your trail rig Xterra...maybe...

I guess $55,000 is a lot of money, though.
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Edit: Almost forgot this stuff. Here are some places that might be helpful.

Perhaps a set of these headers could be used - you will have to contact them.

4x4Parts.com might have some performance products that will work.

If you want to get really expensive, it looks like Malvern Racing does custom stuff.

I also know that Spencer Low Racing has cams for the 4-cylinder engine.

One last site, which has a lot of information on the KA24 engine, is this one.

Good luck!
-Brad

[ 10-03-2001: Message edited by: Strom ]