The Reyland Sierra is 605 on a GT35, not a GT30.
They WANT a GT30 as a GT35 makes the car shit to drive really.
Good boost levels from 4.5k up, but like most T4 engines, boost and power is different, and it dont get SILLY fast till 6k really, esp as its got the largest exhaust housing on it, as smaller ones give too much surge.
I hated it when i first drove it, its grown on me now, but I can see a GT30 being a lot better.
If you wanted 550 max a GT30 or id personally like to try a Turbonetics GTK500.
GTK550 is next up, thats a 600bhp max turbo.
Does look pretty sexy too...
