Flowmaster X kit vs Pypes X kit, any experience with fitment?

Why and X pipe? Take and X pipe and stand it on end. Drop two turds down at the same time one on each side and see what happens at the intersection. Designed for Ferds First two pics is full 3 inch TTI H-pipe. the rest of the pics are 3 1/2 inch H-pipe Dumped at the rear but continue with 2 1/2 tail pipes. Both cars make big HP Numbers X pipes killed them in the middle.

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