what can be my next upgrade ?

my car has intake, exhaust 3.0 (no downpipe), boost controller, stage 1 clutch what can i do next to give it more power ?

downpipe

I dunno if this has been said yet, but either get a high-flow cat, or just plain old gut the cats that you have now.

I agree with Igovert, if you dont have emissions, then get the stillen downpipe as it removes the catalytic converter (same as getting a testpipe) and the front precat, then just gut your rear precat before you install it. You'll see a nice gain and a better and deeper tone from your exhaust.