it's all about how much $$$ you have really. Figure out how much you are willing to spend and talk with some shops like secret services on what to expect RELIABLY with that much dough. If you are unimpressed than use your $$$ elsewhere. It's when people don't spend the money to do shit right the first time, that you start having problems and wish you had a second ride.
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02 WRX
K&N, ic hoses, up-pipe & turboback