1st. I am fitting a stage 3 turbo kit soon. And i want to know if single mass flywheels are any good with 2008 S3? Spoke with REVO, they told me that if i use single flywheels it might have problem Changing gear? The Single flywheels might not suit S3 gear box well. Any suggestion which one should i get for my S3? 2nd. I have fitted a Forge DV into my 2008 S3, FMFSITV - Replacement Vacuum operated Valve for VAG 1.8 and 2.0 FSiT where i think my car should used FMFSITVR. my car now have stage 2 plus, so when ever my car is running with boost. i push the clutch down. the RPM drops down to 600 and comes back up. I have check the spring in the DV its the Green one, which only holds 5-15psi. And my car now runs 21 psi. If I change to the FMFSITVR and change the spring to a higher rate one, whould that fix the problem? Or its the ITG intake ?? Any infromtaion would help. Thanks so much for reading and helping me out.