i have the stage 3 for the tt which is operated by boost pressure rather then maf or tps but i love it it has made tuning for it difficult but you can see pretty decent gains if it is tuned for it right its just difficult because most tuners are not familar with it yet.
i also have a question about the maf setup mine came with only instructions for the boost setup so how would you go about seting it up on the maf or tps and when does it kick on and such ?