I installed the Pypes X- system on my ’70 TA a few months back and it was significantly different. So much so that I cut the x-pipe apart and welded in a blank to create standard duals. I just wanted to hear the difference between two identical systems, so the type of muffler or the size of pipes was not factors. The system with the X-cross over was much quieter and with little to no resonation. Without the X-cross over, (straight duals) it was much louder, but now with the significant resonation at 2300 to 2600 rpm. Personally I like the sound of the straight duals, but I can do without so much resonation. In the future I may try allowing some cross over to see if I can lose some of the resonation and still keep the sound that I want. BTW I cut the X cross over out altogether after my experiment and welded in clean 2-1/2” SS pipe to get full flow. Hope this helps.
John
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