Get the largest resonator you can get. I had the same set up and put a Brullen res in. It droned a bit sometimes but was way better. I've since gone back to the stock y, so there's no drone at all.
Black 98.5 SVT w/ KKM intake, 73mm MAF, ASP pulley, Optimized stock Y-Pipe, 24mm hollow rear sway bar, Magnaflow resonator, Magnaflow mufflers, Roush springs, KYB struts
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