(When ordering please specify if your car is a Z3 or Z4 Chassis)Please tell us which oil pan your car has from picture #5The Achilles Motorsports Oil Pan Baffle for the M52TU and M54 engines was designed and manufactured to be used on racing, high performance track and street driven cars. Each baffle is precision laser cut from .090" heat treated aluminum then hand assembled and test fit to ensure accuracy and the easy of installation. Our baffle design incorporates dual trap doors to prevent oil from splashing out of the sump under hard braking. This helps minimizes sloshing of the oil inside the oil pan and keeps the oil accumulated around your pickup tube. The factory BMW oil pan doesn't do a very good job of keeping oil accumulated around the oil pick up tube in high g-force situations. By keeping oil accumulated around the pickup tube you can eliminate the costly loss of oil pressure and potential damage to other vital engine parts commonly caused by the high g-forces, hard acceleration, braking and high speed cornering. Fits the Following Vehicles & Engines 1998 - 2005 BMW E46 323i, 323Ci, 325i, 328Ci, 328i, 330Ci, 330i Coupe, Convertible, Sedan -- SpecE46 Legal! 2003 - 2005 BMW E85 Z4 , 2.5i, 3.0i Roadster BMW M52TU BMW M54 Oil Pan Part Number: 11131432703 Tech Tips! Professional welding is required for installation (Instructions Included) At the same time, while the oil pan is removed we HIGHLY RECOMMEND upgrading your factory oil pump with our Achilles Motorsport Upgraded Oil Pump for the M54 & M52TU engine. This is a MUST for anyone who tracks the car or is a spirited driver. After witnessing several instances with sheered off oil pump shafts or the oil pump nuts coming loose resulting in instant loss of oil pressure we decided to come up with a solution - Don't let it happen to you!