Yup, I read the post on 911turbo.com and found it quite interesting. I'm sure that was the result when John Hunt performed his back-to-back tests a while ago. Can't remember whether there were no gains at all or losses.
Still, I'm curious to see what PowerFlow find in their tests on the same day under the same conditions etc.
John actually fitted a sport version of the GHL Muffler and found he gained an extra 40HP!  Gotta get me one of those, or at least a gutted muffler. I love noise you see 
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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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