I have the Magnaflow Dual exaust. It's 4" turbo-back straight-piped into dual 2" pipes w/ 5" chrome tips. I totally agree with the earlier post that said it was nice on the highway but gets flat out LOUD when you floor it. If you drive my truck under an overpass and flog it...it will rattle windows..it's flippin' LOUD. Plus w/ the straight pipe it has a very nice sound when it's idling, you can hear the turbo really well. Overall it's a very nice system and will last a long time.