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eh, slight. Mandrel is always better. Perhaps you can try to compensate for it by getting 3" press-bent piping? And I hope you are using a pretty big T3 on that B16.
Brian Sharer ran a 9.92 in the 1/4 with crush bent IC pipe and exhaust, on a 5.0 trunk car with stock 302 pair of .60/.63's, and a prayer the block didn't split right down the middle.