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The XFI factory cam gear is advanced 6 deg from the factory regular cam gear (non XFI cam). The regular cam timing is actually retarded 10 deg at the crank, dirty little secret. That puts the XFI gear at only 4 deg retarded. A worthwhile improvement is the 10 deg adv gear from 3Tech, effectively getting the cam straight up, regardless of which cam you run.
Another improvement over the XFI grind is the 3Tech "econo grind" with similar duration but a little more lift. Both pieces together will set you back around $200 plus shipping from Canada. The resident B'ville salt flats racer at Teamswift.net documented +15% hp and +22% torque over stock (non XFI) with that "econo" cam and gear and mildly ported head in a mk4 chassis. Check in with Mike Cove : 3tech at teamswift.net
Now on to the best mod ever for the 3 banger, any lightened alum or steel flywheel from a 4 cyl swift GTI. go big and pair it with the aluminum underdrive pulley to remove rotational mass, the throttle response is unbelievable at cruising speeds and everywhere in the rpm range. Bucks up, but eye opening.
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