Which Twin turbo?

VHRpurr

Fast Intentions.

Depending on your HP goals, either of their stages are solid. There is also a Stage 2.5 aka "Stage Seb" which is I believe is about the size of 2x GT30 turbos if you need to make 700hp with ease.........

Just buy the FI fuel kit. Guys are making 700whp on it with no fuel return....

What else? I'd go do some research. That's a long list, and specific to what you want/need... I would say an easily overlooked item is the FI crash bar. Definitely get one or your intercooler becomes your 5mph "foam padding" and thats an expensive replacement IMO......

Fuel return: Depends on your goals....

Catch can: You aren't running one yet? No seriously..... Even NA I'm running 2... The blowback is for real on VQ engines...

The crankshaft isn't your limiting factor. I believe it can do up to or over 1,000whp...Your connecting rods however.... Stick around 480wtq or less and you'll be fine assuming the motor is healthy. So, before you spend the $20k+ do a compression and leakdown test. If all is solid, then spend the $$$