For NA, the Corksport exhaust is a good choice...cheap, yields as much gains as you'd probably see from another, more expensive exhaust, and much lighter. (Something like ~ -40 lbs over stock?)

 

But keep in mind its very loud for an NA.

 

It's been said already, but I don't think the advice has been taken, or this thread is jumping ahead of itself, GET YOUR ENGINE/CHASSIS RUNNING LIKE STOCK!
Once you have familiarized yourself with your piece of art, and it's current running status, you will be more apt to make a sound judgement to where you would like improvements.

If you want to actually GO faster, your answer lies with chassis/driver skills. The only place a car contacts the road, and where ALL forces are applied, is with your tires. Get your tub feeling good. Then move on to making your engine stock.

Engine-Fix vaccum leaks, and little quirks that prevent your engine from running like your ECU want's your engine to run. Once you know everything is right and true. Begin to molest your 7.