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i got a real problem with my vi in 1st and second cars pulls good but from 3to fourth it sucks from about 45-65 its horrible thats were i lose all the gain i had on the car that im racing ie at the track dont strret race wut parts can i use to get rid of or minimize taht effect ima try out the new crower cam they have avaible wiht a race ported head i think i just need a tune just puttin in my .02$

 
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Apexi world II exsaust helps in the mid range, especally if you got a pnp, and new cams. You could also get rid of some weight on the car, ie seats and what not.