http://www.turbobygarrett.com/turbob..._700382_12.htm
gt3076r is only good for 525hp not 600hp

the problem is not the turbo but the ls head
400hp would be pushing the ls motor

but then again tom did 600 on pump i could be wrong.

bro sell this vr6 for me 3200 cash i need it gone i can only have 2 cars in my condo