you could also try using vibrant mufflers. they're a little more expensive, but they're great quality and they're all straight thru perforated core mufflers for the best flow. there's a bunch of different sizes even flat black mufflers so that they're not noticable. i've seen a setup on a new Subaru Legacy GT....all 3" piping, dual flat black mufflers and stock looking chrome tips. if you didnt know it had an aftermarket exhaust, you'd never be able to tell. here's a link to an ebay store that has a lot of the vibrant mufflers at decent prices
http://stores.ebay.com/Verocious-Motorspor...idZ2QQpZ3QQtZkm
now that i go back and read that ^^ it sounds like a vibrant performance advertisement :P