If they have 2" that would be a better fit. The pipes neck down to ~1 & 5/8" on both the inlet and exhaust tip OEM.
I just went to a single exhaust myself. Hard to find a good tip. The first time I had a stock pipe going back around the gas tank, then 3" out to one of my Bullet muffs. I thought they were 2.5" but they were 2.25" and the bucket heads uses a piece of 2" ID from the flex pipe to the rear pipe.

I could tell this really limited the +6k rpm as it had a hard time getting to the WOT 3-4 shift point.
Tweaked the AF curve and got pretty good under 100 mph performance. But went back and had the 2" pipe replaced, I said I wanted 2.5" and came back to a 3" pipe.

And they put on a Magnaflow 11229 3" in and out SS muffler.
I had a 90* SS 3" tip. It look like :hpoop: though so I took a cut off wheel to it and made 45* slant tip out of it. Really can't see it as it is a bit recessed from the outer edge of the bumper cover. Looks good seeing as with one prominent tip the SHO rear end just doesn't look right with the sculpted areas for the OEM tip.
But it is quite loud.

And again had to go tweak the AF curve to compensate for the low end power drop off. What I ended up with is no third cat, 3" ss from the flex pipe to where the resonator was, stock 2.25 ID with the mandrel bends around the gas tank, then 3" ss over the control arms and to the 3" ss muffler and 3" ss tip.