New to the forum, but thought I'd share some information for anyone who may be interested. Probably not a modification that everyone is looking to do, but here's a quick write up on how I changed from the factory "cartridge" style oil filter to a "spin-on" type. The full write up can be read on our website. Google Ptetra Automotive (will update with link when able) The first question you probably have is "why?". Although it isn't a common concern, the factory "cartridge" style filter prevents you from running a sandwich plate for an oil cooler, oil temperature or pressure gauges or relocate your oil filter to an easier to reach location. In addition, since many Toyota engines take interchangeable filters, this conversion lets you use any filter intended for 4A-GE (old Corolla / MR2), 3S-GTE (Celica / MR2) 2ZZ-GE (newer Celica / Matrix / Lotus), or even 2JZ-GTE (Supra) engines, which have far more options available. Although the photos are of my CT, the same parts and process should work for anything with a 2ZR engine including the Prius, newer Matrix, and a few Scion vehicles. All of the parts you need: Oil Filter Bracket (15609-0T060) Union (90904-04006) O-Ring x2 (96723-24020) Flange Bolt x4 (91551-F0835) (Optional) Oil Filter (90915-YZZF2) (Or other filter of your choice) Start by tightening the union into the bracket using a 12mm allen. This can be done after the bracket is installed, but because of the undertray on the CT I found it easier to assemble outside of the car. Jack up the car and drain the oil. You are going to need to gain access to side of the oil filter bracket. In the case of the CT, it is located behind this panel in the passenger's side wheel well. Simply remove the push clips and move the panel out of the way. Next remove the 4 bolts holding the oil filter bracket to the engine. And remove the two o-rings that are used to seal the bracket to the engine. Place the new o-rings in the grooves in the block, align the new oil filter bracket with the engine, and install the bolts. Tighten the bolts down to secure the bracket. Install your filter of choice, fill the engine back up with oil, and check for any leaks. Provided there are no issues, you are done. A simple and relatively inexpensive modification that now allows you numerous options for sandwich plates, oil coolers, sensors, and aftermarket filters.