Gintani also has quad resonated X-Pipe, but in 100% honesty the stock X-Pipe w/ the Test Pipes is gonna be the quietest X setup. Chances are to quiet it down, you're gonna have to go to a less aggressive muffler section.
Challenge X-Pipe is also really popular, you can get it with sport cats & resonators which will also quiet it down, but you'll lose some power since you won't be fully catless.
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