i was interested in the GTX2860 on my car too. What are your specs you got the 2863 right? i have a stock engine, but i will be putting tomei 260 cams in. I am not looking at making more than 550whp as i have my RB26 in a old Datsun 240z, I think anymore than 550whp would be a death wish for sure. Do you think it would be worth it vs the GT2860-5? I would think i would use the smallest ones i could, i wish they had a compressor map but i dont know how to use them anyway. I am also considering the borg warner efr with internal gate for a small or midside single turbo, but i do like the curve of the twins. What do you think?