This is a post from over on MY350z for our HR build. But I figured with the flow characteristics of the VQ35HR and VQ37VHR being so close it will relate to alot of the 370z TT guys as well
So we just received our GTX2863's for our Twin turbo HR build that we are doing. Dimensionally the are the same as the 2860's with a lot more flow potential up top. We are looking to get the best possible spool with out sacrificing power up high. we are using .63 exhaust housings with V band outlets. They also have a .86 housing available. They also have a GTX2867R option which we might switch to later if we wanna make bigger power...some pics for ya guys
GTX2863 Compressor Map compared to a GT2860RS(disco Potato)
GTX2863R next to a GT2871