Hi guys...
Personally usmann, the T88 is too big. Listen to what people are telling you. If you only (i say only ) want 600hp then its not for you.
Yes, you'll get your 600hp, but you wont get any boost till 5k revs which is gonna be no use.
Get a smaller turbo, which running high boost (25psi+) will get you your 600hp and it'll start making boost below 3k revs and full boost by 4k
And for your info, hardly anyone in the states has a T88, for all of the reasons above. The only car I know that has one and is making good figures is Jesus's.
There are so many better kits available in the states - DE, SP, RPS to name a few.
Gaz.