you have a built motor with LTs and no cats.... did u expect it to be quiet?
I had a similar exhaust setup with a magnaflow and it was insanely loud. due to pipe size and no cats, thats what you're gonna get.
If you want quietER, get 2 universal cats and have them welded into the pipes right after the header flanges. then to cut additional sound go for a muffler like dynomax ultraflow or a spintech. If its still too loud after that, i'll sell you a complete stock manifold-back setup which will make it quiet.
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