My experience has been this: I went up from a GT-40 Intake(Same runners as the Cobra, slightly more out-of-the box power though)to a TFS Street Intake. Made lots more power, and I went up almost 3 mph in the quarter, but I also added a 70mm TB up from stock. I think the main reason I saw such a big jump, is that I have bigger and higher flowing heads than you, that the intake matches my heads, and I had a stock TB. I think for your setup The TFS will be best, because it is proven to make more power all over, and is only $65 more if you have a aftermarket FPR.(TFS SH Intake-$395, Spacer to allow FPR to fit, $50, +shipping)
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Dustin
1990 Saleen GTSport #14
TFS Street Heat Upper & Lower(Black), TFS TW heads, TFS 3/8" Phenolic Spacer, E303 Cam, FMS 1.6 Roller Rockers, BBK 70mm TB, FMS 70mm MAF, MAC 1 5/8" Equals, Dynomax Super Turbo 2 1/2" cat back, Bassani 2 1/2" Off-Road X-Pipe, MSD 6AL Ignition w/ MSD TFI Coil, Home made Ram Air, Racecraft Suspension
60ft: 2.158
330ft: 5.396
660ft: 8.271 @ 91.43
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