I always liked the Greddy kit; it was an easy install. How much psi you wanna run? Think about it, without upgrading internals, you can't run high boost anyhow, so why not get the Greddy kit and run it reliably at 10psi. The stock con rods are good to about 200hp and those crank bearing won't last nearly as long. I know people say other wise, but I seen too many GSR's overboosted and not well tuned blowing up like F**kin SH1t.