I currently have a modified Hellion 76mm single setup, and have been thinking about going up to an 88mm in the future. I was curious about how much would have to be changed to accommodate the bigger turbo. Any info is appreciated.
give hellion a call. I can't remember exactly since they don't really offer the 88mm kit anymore, but IIRC, you don't have to go through everything that faststang did with his custom setup if you use the same 88mm that hellion had in their kit.
you will need to change the downpipe and I think you will need an adapter since the 88 is a T6 flange and the up-pipe is a t4. I don't think you use the turbo bracket anymore, but could make your own.
there will be some other things. you can also pm hellioncobra. he had the pre production kit on his car since he was the test mule and could give you more info.