I am purchasing a gmpp catback and getting a tune later this summer. I have been asking a lot of questions on here and dont really want to go far outside my warranty, call me a ***** but my father bought my car and if it needs to be repaired outside warranty because i bought something to make it go faster he will make me pay for it. I was considering the gmpp header but since it only gives such minimal gains for the price which is about the same as the UDP. I realize the UDP would probably give the same HP gains but since im revving up faster wouldnt it increase my 0-60? Basically the question is does anyone have any advice on the MRZ Underdrive pulley with the shorter belt, and the Alternator pulley is that even worth it or just an extra red thing to put under the hood?

 

i havent heard great things, puts too much of a strain on the electrical system especially if you want to keep your warranty. if your gonna get a tune just do full bolt-ons (headers, dp, catback, and intake) before the tune then your set

 

I second this motion

 

ya UDP's screw with your other parasitic accessories, dont bother