Not sure if this will help but I had a custom system built with Goulrich XLerator transverse muffler and no resonators. This was a stock 68 400 HO convertible. It was SUPER LOUD! So loud in fact, I was concerned about getting a ticket. I had small resonators added to the system and it quieted it down allot. I did not use a X or H pipe because since it was a convertible, there simply was no room with the chassis cross support bolted in right where those pipes would need to be.
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