Engine seems powerless until higher RPMs

[Spudboy]

It does nothing to increase intake capacity without increasing the exhaust capacity at the same time. (and visa-versa)

Also, be aware that many aftermarket intake, downpipe, and exhaust set-ups are not street legal in many states. If you care, check this before you buy and install. In California with our BS smog rules, anything good is not street legal so every 2 years when a 'smog certificate' check comes around, you would need to switch back to stock stuff to pass. If you're willing to go to this trouble...save your old stuff if needed.

(Don't expect the supplier to tell you it's not street legal...they may not offer this info, but just take your money.)