good job man! been reading your progress, I've decided to go engine performance first, bought myself plazmaman intercooler kit and also booked in for a tune, injectors and cat, just going to run a straight through pipe off the cat into a twin 2.5" exhaust, should sound alright, and think about a full exhaust system later in the date when I start working on the outside to make the car look like an animal. good luck to dude.