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?
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Merv
'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 03:39 PM..
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