Csam

Hi, first of all, sorry for my english, i normally speak french, i'm from belgium.

I have a 2004 WRX 5mt gearbox with some engine mods :
Results with a wheel dyno : approximative 300 bhp (din) @ 5500 rpm and 400Nm (300lb-ft ?)@ 3500 rpm
...33% more Hp and torque 1000 rpm earlier.

I think my clutch have some problems when i heavy accelerate in 1st and second gear... it s slipping and i have a burning clutch smells 10minutes long... i have no problems when my ride is soft...

The best solution is to put a better clutch, some one tells me, its better to buy an STI clutch... is it possible on the 04 WRX ? Is it needed to change the flywheel ?
Subaru belgium tells me a performance clutch, will destroy my gearbox...

What's the best sollution, for street use... and somes HARD street use ... (no On OFF effect please) and i want to preserve my gearbox

Thanks !