On the tuning side of things, make sure you are finishing the tune up on a dyno. Remote tunes are good to get you around for a bit with boost, but you really need to have a quality tuner spend some time on a dyno with the car to iron out all details.
On the exhaust side of things, skip the stillen. I have heard the ARK in person and it is a good system. Rasp should be minimal with any exhaust if you are keeping the stock cats, if you plan to change those to HFC or TP then you open the system up for more rasp or drone.
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