because you won't use a lot of the bolt on parts and you won't be able to sell it 50% of what you paid. so it's considered a waste of money to buy those parts when you know for sure you'll boost it.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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