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You CAN modify the 930 headers (the collector portion) to mount the turbocharger high enough for gravity drain. Don't waste ur time with an electric scavenge pump. What if it fails? DOH!
The safest way is to just make an adaptor piece that mates to the 930 header which mounts the turbo a few inches higher. That way, you can use gravity drain AND also replace the muffler with replacement 930 headers in the future, if need be.
That's similar to what I've done. I've used a Mille-Miglia 930 muffler with an extension piece fabricated to mate to the Turbo's exhaust housing. If I need to swap the muffler out in future, all I need to do is get a 930 unit and swap it in. Easy!
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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 
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