I'm putting together a turbo kit using Trick's exhaust piping/cast manifold and have been eyeballing Turbonetics turbo's due to cost. For around $800 I can get the either the 72mm with the smaller .81 ar housing or go with the larger 76mm with the .96 ar housing. This is a bone stock 5.3l with a 4l80e behind it. Will be a low boost 6-12 psi truck shooting for 500-600 whp Suggestions?

 

Go with the 76mm you will be happier in the truck with that then the lesser turbo power won't be an issue either you should be right in the 5-600 range with that setup with a good tune and stable fuel system.