Heads are THE power makers, that is what is holding back the stock motor back, the stock E7 heads. You can get a set of aluminum heads for around a $1000. They will add ALOT more power than all the lil bolt ons combined, minus a supercharger, and nitrous. You'll see a HUGE increase in power over stocker. But if you don't want to splurge for aftermarket heads, I wouldn't suggest buying another intake for your stock heads, you won't feel a bit of difference over stock.
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