This is a forged piston and connecting rod combo kit for the BMW S63 twin-turbo 4.4L V8, built for high-output street and competition builds. The connecting rods are machined from 4340 aircraft-quality steel in an I-beam design, Magnaflux/X-ray inspected, shot-peened, CNC-finished and weight-balanced to within 1.5g, and are supplied with ARP rod bolts; the pistons are forged from heat-resistant, low-expansion 4032 aluminum alloy, pin-fitted and balanced before shipment, with an 89mm bore.

Fitment: BMW M5, M6, X5M and X6M with the S63B44T0 or S63B44T2 twin-turbo V8 engine, covering the F10 M5, F12/F13 M6, and F85 X5M / F86 X6M chassis.