Keep in mind WHEREVER the muffler is, that's where the noise and drone will be, especially with glasspacks. They will be right under the front seat. I've found that header mufflers like that are actually worse than open headers. We used to run open headers and header mufflers a LOT back in my school days. Never got a ticket. Hardly even got looked at. But I always preferred open headers. The header mufflers really bring out low frequency that can just bug the crap out of you. If you're going to do anything, I'd get something like Dynomax turbo mufflers and run to the rear axle with turn downs, not aimed straight down, but down and to the sides. That way, the noise won't just bounce right back off the ground.
