I have a 08GSR, I have a Harmon Motive Intake and upper intercooler piping, a MBC, and a boost gauge, the MBC hasn't gone in yet. I'm waiting till I get my tune.

so I want like 350-400 at the wheels, what do I need to do?

so Tune E85?

Fuel pump,

injectors. 1000 CC?

would my clutch hold up?

 

tbe, tune, injectors, fuel pump and most likely a clutch

 

i dont think a FMIC would be a bad idea.

 

you should go ahead and get a tune with your current mods and see where it takes you. If you dont abuse the clutch to much you might be able to get some life out of it but you should defiantly think about the cost involved in a new clutch...