Well after about a year of thinking on and off about the perfect way to get dents out of exhaust pipes, it finally hit me last night. I instantly went to work in the garage to test my idea. I had two old kart exhaust pipes that I kept around for this very purpose. One had a 1" long by 0.5" deep dent about 4" from the flange. The other had a big round dent about 2" around in the middle of the pipe. I made the fittings (two required for each exhaust pipe) for about $2 each, and they are reusable forever, only needing to make new ones for different sized exhaust pipes. It took me about an hour of trial and error to perfect my idea but once it was all set up it took about five minutes each pipe to actually get the dents out. It is completely safe way as I am standing about 10ft away when it's actually time to pop the dents out. This type of exhaust pipe was especially hard since the pipe and silencer are one piece with an end cap, but it's still very doable. This means that a normal exhaust pipe (e.g. one for a motocross bike) will be even easier. I should be able to do two cycle and four cycle pipes and silencers with ease. I'm going to start doing this for guys around the track and move from there, as well as pipe refinishing, rust removal, carbon removal, repacking, straightening, among other things and possibly replating if I can find a source to do it inexpensively. Problem is I'm fifteen and I already have three jobs so it will be hard to find time for.

Pretty sweet, eh?

hmm nice idea, heres a plan dont elaborate much more on how its done, get this idea patented . but damn where were ya when i needed this kinda thing about a year and a half ago

Sounds like you might be using heat and compressed air.  That service has been available since way back when and still is, but the stock headers are double-walled, so I don't know how they handle that...

Yeah the Compressed Air and Heat has Been Around for 2 Stroke Chambers.I bought a rig  to do it.I've tryied it several times but wind up doing too much welding to try yo get the Cracks and Pin Holess Stopped enough to hold enough Air to make it work.Water and a Pump is another way.Another Guy I saw do ittook a Completely Collapsed Denco Chamber for a Kawasaki H2 and Filled it full of water and Froze it.Not Pretty but it worked.I've resorted to a Stud Gun and Shoot Suit.It still pops Holes in the Metal but I still have to weld up the Cracks anyway.

Fixing dents in pipes is nothing new, I've been doing it forever - look at www.piperepair.com they do the same thing. I just found a much better technique.