It's a branded K&N filter that they use. You can just send them an e-mail asking the part number. They have good support, so should respond quickly. You can also bring in your TK filter to a parts shop to match it. Any 3" ID cone filter will fit on the tube, it is the area that the filter sits that states what size you need to fit in your car. I believe it is one of the smallest 3" ID filters that K&N carries.haha i meant just the filter.. I want two just for a backup one. Do i have to order the filter from tubrokits or what?