2008 A4 MT 2.0T Quattro APR Tuning Question?
 

Hello all. I am new to this forum and I am tuning my, new to me, 2008 Audi A4 MT Quattro 2.0T FSI.

I just did the APR stage 1. Works great. I am upgrading to an APR stage 2+ (APR HPFP + APR Test Pipe) next week, and I want to know if I need to get any other parts to ensure reliability. i.e. pressure blow off valve, etc, or if I'll be good to go. Also, should I get the sprint booster, or carbonio intake, or are they little return for the cost?

My car is super tight and has low KM's, so I just want to make sure I'm not stressing anything too much that I shouldn't be. Thanks