basically the 650 IPE full exhaust can also go on the MP4 that goes from the turbo back, and includes a 150cell cat.
It is by far the best sounding and responsive exhaust available.
it is not simply a loud sounding exhaust, the music it plays depends on how ur right feet behaves and which shift lever u pull.

It is the fierce sucking sound from the intake, turbos and waste-gates that makes this a must have for any 650 or MP4.
When u left off the gas suddenly, the explosion alone from the exhaust is worth the price.
youtube videos will be uploaded shortly.
For once, mclaren sounds much better than ferraris and lambos because of this.