hey im new to this forum, and forums in general. I am seriously looking into going to stage 3 with my 01 a4 1.8t quattro. Im just trying to price out everything that i may need or should buy when doing so. Ill start everything out by going through Stratmosphere (stage 2 through them already) but i dont know if i should or need to change out diff's or how crazy i need to go...if any one can help let me know thanks.