Carrillo connecting rods are highly regarded in both professional racing and street performance circles for good reason - they manufacture premium products that winning racers around the globe depend on. At Carrillo Industries, quality and pride go hand-in-hand. Each Carrillo rod is crafted with winning in mind, and they have proven to be a top performer in both street and racing BMW S63 engines. Carrillo's fasteners and "Carrilloy" rods are highly sought-after by all racers who seek the best. Some of the key features of Carrillo connecting rods include: Special chrome-moly based alloy forged rods Lightweight design that reduces mass compared to stock rods Proven strength and performance in racing Exceptional quality control with tight tolerances and balancing Available in matched and balanced sets of 8 Includes high-quality, non-stretch WMC rod bolts Optional upgrade to CARR bolts Rod Bolt Instructions available Here Note: These connecting rods are symmetrical and do not require a specific front-to-back installation orientation, unlike OEM rods. Will NOT Work with factory OEM Pistons!  Please note that these 138.5 mm connecting rods are designed to fit BMW N63 and S63 engine found in the following applications:  SCR11938SCR11940 5 SeriesF10 / F11  550iF10 / F11 550i xDriveF10 / F11 M55 SeriesG30 M550i xDrive6 SeriesF12 / F13 650iF12 / F13 650i xDriveF12 / F13  M67 SeriesF01 / F02  750Li xDriveF01 / F02  750iX5 SeriesE70 X5 ME70 X5 xDrive50iX5 SeriesF15 xDrive50iX5 SeriesF85 X5 MX6 SeriesE71 X6 ME71 X6 xDrive50iX6 SeriesF16 xDrive50iX6 SeriesF86 X6 M