My GTO has headers, 2 1/2" head pipes, 2 1/4" tailpipes and Waldron resonators. The mufflers are the long Dynomaxs. It also has an H pipe. Its really quiet. At WOT the air intake is still louder. Use Remflex header gaskets; they really seal well. If you want a little GTO style throb to the exhaust don't use an H pipe or an X pipe. The X pipe makes the exhaust note a little higher tone. I have one on a different car. They also reduce noise.
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