JE Pistons Audi TT RS 2.5 TFSI 5 Cyl Ultra Series 82.5mm Bore Piston Kit (Single) fits_1964 1969`Pontiac`Tempest`Safari~1971 1974`Pontiac`Ventura`Base~1973 1974`Pontiac`Ventura`Custom~1974`Pontiac`Ventura`GTO 1964 1968 Mercury Montclair Base 1960 1972 1964 1968 Mercury Montclair Base 1960 1972 Mercury Monterey Base 1962 1963 Ridetech Coil Spring 10in Free Length 525 lbs in 2 therefore reducing piston crown temperatures and improving exhaust gas scavengingHigh Strength Wrist Pins: Premium thick wall wrist pins are manufactured by Trend Performance in the USA and are designed for the demands of high performance power adder buildsLateral Gas Ports: Help maintain power producing ring seal at the top compression ring especially on cold startThermal Barrier Crown Coating: This ceramic based coating reflects heat into the combustion chamber