Pipe dent remover
 

Purchased this on Ebay, well worth it! Not perfect but cheaper then replacing.
http://i105.photobucket.com/albums/m...psxr3mhb4l.jpg
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I have a similar dent tool, you need to heat the pipe more you could get much more of that dent out, I could get that at least 90% out you look like you have only got it about 50% better. You need 80-100psi and heat the pipe slowly so you can watching the dent come out so you can apply more heat in the correct area.

It was my first go with it. I was a little nervous but will give it a good heating next go around.

I found with my home made death trap contraption to plug the ends, then heat the dent, and only then to apply air pressure. If I pressure it up before applying heat, the thermal expansion of the air inside the pipe overwhelms the safety measures on the plugs.

In short: Heat first then air = good.
Air first then heat = dents in garage door.

Good points! Also you can engineer a built-in leak by putting a valve on the other end that you can crack open, then as you heat the pipe just watch your PSI on your gague

here we used about 30psi, much more in my comfort zone:

https://www.youtube.com/watch?v=idxX...qKv0RIp9jl6463

You need to remove the carbon and oil inside the pipe before in order to prevent pressure increase.

Do you have a link or contact info for the tool!

I watched a mechanic use a homemade set of plugs to get dents out of an expansion chamber. Hooked it up to air, put in 20 psi and heat the dented area with his Acetylene torch carefully. He got the dents out almost perfectly as the metal became cherry red.

80-100psi YIKES!

I would stick with 20-30 and use a real torch.

Nitrogen is way safer as it does not expand like air. That is what my brother uses.