For a true bolt-on upgrade, you can't go passed the ImagineAuto K27-7200/K72-HFS turbos.
However, if you are after a ball-bearing solution, I'd recommend a GT30R for up to 500HP, or a GT35R for ~600HP. Amazing spool-up
Of course, these are not 100% bolt on, and you'd need to modify your muffler flange to mate to the turbo and use a smaller oil feed line and modify the flange on your oil drink tank to mate with the GT turbo.
Are you running aftermarket headers, or still the heat exchanger setup?
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Last edited by WydRyd; 01-11-2007 at 02:39 PM..