Polini Racing & replacement exhaust systems are always manufactured for top quality and performance. The Italian manufacturer tests and develops its systems in its own development department and demands the highest standards from its products. This exhaust is a limited edition with a serial number. Caution! The Evolution P.R.E.. Exhaust systems have been designed for the Evolution P.R.E.. Cylinder kits designed to eek out the last drop of performance from an engine. To withstand the higher compression of the cylinder, a special exhaust flange with 3-point attachment is used. That’s why the Evolution P.R.E. exhaust systems should only be used with the P.R.E cylinder kit. The supplied bracket also fits onto the optional Polini Torsen WD swingarm. This gives the necessary stability with highly tuned engines by relieving the load on the crankcase.