Time to share my build thread.
Bought a 2008 S3 last year. Got it with a 76 mm Dp and full exhaust. No catalytic problems down this side of the Equator.
Forge DV came with the buy.
I've since then added some extra bits. BSH delete, Autotech HPFP, ITG intake, RS4 Fuel Regulator Valve.
Bought a extra engine cover thats has been modified.
Changed the Pulley on the cranck.
Changed the bushes, Lowered the suspension with Joms Coilies and added Haldex Controler.
Fitted Twin Intercooler.
Got the pipe between the Cooler and Throttle body for the Watermeth Nozzle. Mounted the AEM progressive kit in the boot in the spare battery box.
On the interior, added the Audi Blutooth with SDS to the RNS-E radio. Did LED lights on the roof lights.
Got the Liquid gauge fitted in the Right vent.
This is what it looks like now.