I think the norm is inlet cam with std exhaust but take advice on that. Hart inlet flows better but std is not too bad on spacer.


Go for a Borg Warner twin scroll turbo AND Manifold as it will blow the GT30 in to the weeds for response....the Borgs are just soooo much newer and advanced technology but you need the twin scroll manifold to get the most out of it.


My 200 block is 100% std and made near 500 just with the correct size exhaust, correct twin scroll manifold and borg warner efr 7064 (there is now a smaller one that spools quicker and can still do over 500 bhp) My cams are std as is the head and pistons.


It was mapped by Mark Shead and he commented that it would have gone above the 469bhp if my RS500 cooler was better and if he trusted it more as I have std studs and gasket.


I cannot upload the map at the moment for some reason but my car is making over 300 bhp and 300 fltlb at just over 3500 revs and is at 1.5 bar around there too.