I'd have to agree, no more than glass packs cost it would probably cost you as much or more to pay for the reducers and labor if applicable than to just put the 2" on the shelf & buy 2.5" Cherry Bombs. Gotta agree about the noise too, I might use them as resonators, but no way I'd run just glass packs for mufflers again. That kind of attention from the local police I can do without. I'm kind of surprised how loud of exhaust some people get away with running but around here it would only be a matter of time before the tickets starting coming.
Later, Jim