Tuning Audi TT - parts sources?

I’d like to start sourcing parts for my 2001 Audi TT (225hp, quattro) but it seems all of my internet searches are turning up dated sites. Not much stuff after 2006. Can anyone point me towards quality blogs or websites containing parts such as ECUs, blow-off valves, and exhaust piping? I didn’t think it would be super difficult to source stuff for an '01 car!

Check out www.vwvortex.com. Your car is basically an AWD VW Beetle. They share the same platform, and use many of the same parts. So you very well could use aftermarket VW parts for your car.