Has anybody tried this?? I'm asking because I'm trying to figure out if what I want to do is possible. I sold my Z and got a Q50S with the same engine and I have some parts leftover from my Z that'll work on my new car (M370 intake manifold, UDP's and test pipes). If I add intakes and a tune?, will the tune only work properly with the exhaust cut outs open, or would it run correctly even with them closed? I know I'd be leaving some hp on the table but its a family car sometimes.