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I'm running pypes complete(tail pipes also) 3" set up with the X and dumps. This is on a 490 stroker BBO I have run it with the open exhaust and with it closed and have seen no difference in ET or miles per hour. The X does make it a little quieter, helps at the track when they have a noise limit.
The hole set up with hangers and band clamps was $650. Jkaz
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72 442 conv. 455 +.060 th400 3.31 12 bolt
70 F85 490 stroker, th400 3.73 12 bolt
87 Buick GN
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