Just because your car revs to 7200 does NOT mean it would be worthwhile to do it. If you've ever seen a dyno, especially on a non-VTEC engine, power dips off in the upper RPMs very, very quickly. Revving to 7200 in a J30 (I assume thats what you speak of) would do no good unless you're making power up there (which you are not doing unless you have an aftermarket ECU).