Well guys I just wanted to let everyone know I tried the Caster Grenade pipe on my PTM 5 port all day at the track and I have to say its awesome. I will never put the Dynamite 086 back on there unless I was paid to. Smoother band better runtime, just all around a better pipe. It has the length of the 086 with the taper at the end of the 053 but the body of the pipe is much fatter. Now the header is a work of art it is much thinner than the 086 header but much longer. Total even know the pipe is the same exact length the pipe and header is about 1/2 inch longer than the 086 at least. If you have acces to this pipe try it. I easily got 1 minute more runtime out of it to i couldnt belive it.