MAHLE’s relationship with Porsche dates back to Porsche’s beginning. Together they have developed some of the best competition and sports car engines available throughout the last nine decades as an OEM supplier to Porsche. The cast aluminum Nikasil-plated cylinders included in Mahle Motorsports aircooled Porsche 911 piston and cylinder kits are produced and machined to original equipment tolerances, designed to provide increased performance, durability and longevity. Some applications are available as either a slip-in or machine-in design. The slip-in cylinders are simply a larger internal bore replacement. The machine-in cylinders require the engine cases be machined to a larger bore diameter to accept their larger spigot diameter. The larger spigot diameter is preferable for extreme applications as with highly boosted turbo or competition use engines. We recommend replacing cylinders as a complete set; if replacing single cylinders it is up to the engine builder to match up cylinder height groupings which may require modification of one or more cylinders. Where OEM Mahle cylinders are no longer available, Mahle Motorsport has partnered with LN Engineering to supply Mahle Motorsport piston and cylinder sets featuring our billet aluminum Nickies cylinders.