These filters are 5" tall, and are available with 2 1/2, 3, or 4" inlets; chrome or black end cap. This is the filter you see on all the big horsepower RCC turbo systems, and on many shootout and Pro Street bikes. These filters will also fit Velocity, Hahn, Mr. Turbo kits, and so on. When you are looking for the least resistance, and the most filtered air you can get, this is the only way to go. They also look mean and let everyone know that you don't take prisoners! Let your turbo breathe . . . set it free! All "powerstack" SHOOTOUT TURBO AIR FILTERS are now on sale for $49.95.