Thread: Borla XR1 Muffeler and no Res?

Originally Posted by Tonkin2000GT

Is the resonator worth having like how much does it fix? I just figured it would restrict the flow so why bother same with the cat.

Have you ever seen the inside of a resonator?

After installing my Borla XS's (PO removed resonator), I went about two weeks before the drone made me pull out my hair. No resonator makes a HUGE difference.

I believe the XR-1 is more of a racing muffler, and is louder than the pro-XS. My favorite sounding set up on a 3800 is a glasspack in place of a resonator, and
two borla pro-xs mufflers at the rear. It's not raspy at all, and the glasspack gives it a bit of a unique sound too it.