Im after a backbox , and manifold etc for a sporting. Id like something that has a deep note off it. I seen a Ashley Full system for £200, which seems like a great price. Does it connect from the end of the manifold back and bypass the long box under the car. Also if anyone has one how does it sound, i seen there vid but id like some opinions on it or if there is any other systems out there with a nice deep note of them............