You don't need the spacer. I know they say you do, but you don't. The TR3550 is designed as a direct factory replacement. Try removing the spacer and see how it lines up.
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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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