These mid-pipes from Mishimoto allow you to carefully tune the performance of your muscle-car exhaust for sound and the kind of performance you want.A mid-pipe is where the pipework from each bank of cylinders on a V-engine cross-over towards the front of the system.Choosing between an X-Pipe and a H-Pipe will alter both the sound and performance of the exhaust.Going for an X-Pipe here will give the exhaust a raspier, free-er flowing sound. It will also optimise the exhaust for high-RPM power with power gains generally happening higher-up the rev range.On the other hand, fitting a H-Pipe here keeps a bit of back-pressure in the system. This means that the exhaust has more of the traditional muscle-car growl. It also means that power gains are going to be in lower-end of the rev range in the form of additional torque.Mishimoto are offering both to allow you to fine-tune how the car drives.