WOW....I just finished my single install, and I think I went WAY too big! I am running a GT42R on a T6 WOTM manifold, 5" DP and man this thing is a pig out the hole! I am sure I can get some lag taken away with a good tune...but I really do not like it at all yet. I am currently running off the wastegate spring, should be putting fuel on in the next week or 2. BTW, this is with a built auto w/3800 stall. The car literally feels like the stock stall/tranny in TTC. It pulls like a mofo after it spools...but damn it takes f o r e v e r ! Its very street unfriendly...wish I would have went with some more stock twins right now...I am sure it will rock at the track with a 75 shot to get it up, but I enjoy driving the car and this has killed the street friendlyness of it....I dont see how anyone running a 47/80 or 88 can stand it on the highway and around town.