Zeroclearance, the HF I had was the original with the 2 3/4" inlet. I was told by the supplier it would flow 550HP... the GT35R is rated as a 600HP turbo... it does flow more air than the original HF I had. The newer HF's have a bigger compressor cover I believe?
'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