I had the old irons on my old car. They did require different headers, but I loved them. They seemed to have more low end than the TW's, but my TW's pull harder up top.
I have the flow charts on both.
Street Heat:
238 cfm @ .500 I
181 cfm @ .500 E
Twisted Wedge:
254 cfm @ .500 I
194 cfm @ .500 E
I think it is a good deal, but you can get new TW's assembled for about $1000.
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Dustin
89 Saleen GT Sport,428 rwhp,TFS Street Heat Intake,TFS TW Heads,TFS #2 cam,BD-11A 9 psi,Crane 1.6 rr's,BBK 70mm TB,Pro-M 80mm MAF,MSD 6BTM, FMS 9mm wires,BBK longtubes,BBK Short H-pipe,American Thunder cat back,3.55's
12.3@119
http://www.mustangworks.com/rides/pictures/Listing1549-slot1.jpg
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