When the head gasket blew in Matt Boulanger‘s 1987 Porsche 944 it severely damaged the stroked 2.8 L inline-four. He considered several different engines but settled on using a 2.5 L KL-ZE V6 from a Mazda MX-6. He rebuilt the bottom-end with CP Pistons and K1 connecting rods. The heads are ported and topped with custom camshafts and valvetrain work. Matt estimates the engine make 375 whp on low boost and 500 whp at high boost thanks to a Borg Warner EFR9174 turbocharger. The engine connects to the stock 944 drivetrain with a custom adapter. See more photos and details here or listen as Matt discusses all the work he put into the 944 below. Then listen to the engine sing on the dyno below that.