I'm not going to lie: cabin noise levels are definitely higher. I knew that going in, of course. The VX sounds much meaner now...and after living with it for a couple of days, it DOES seem to have more HP. It gets up to speed sooner, and seems to 'coast' farther when I let up off the gas.
I'm going to have to try some sound-deadening material in the rear cabin. I wanted to do it anyway, but now I've got some real incentive! I'll try removing the rear seat and then really maxing out some RaamMat under the carpet and behind the side panels.
No regrets. I like the new sound.