when i had my jg edelbrock manifold put on i felt huge differance when v-tec ingaged. deffinetly big improvement! and that was when i just had i/h/e. but now i have skunk2 cams and nitrous, and its probably giving me 3x the hp it was at the begging. great hp gains! expecailly in the long run. but yes you will want to go get your engine tuned after installing.
the skunk2 IM is very similar to the itr IM, its slightly bigger. i know a few people who have them and they all said that they didnt notice a big difference until tuning. i think its a waste of $$ unless you plan on getting cams and a different ecu program that lets you rev higher!!!
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