Freezing expansion chamber?

[4stroke]

Watch doing that 4Stroke that will temper the steel and make it hard and therefore brittle. I wouldn't use that method, you'll end up with more problems than you started with I.E. a stress crack after the pipe has been heated and cooled by the engine over the next 12 months.
All the other methods make sense though. Thats if 10 years panelbeating give me any experiance!

yeah just qurious, ive done it a few times on truck mud guards and tipper decks, works well on mild steel, didnt think it would work to well on titanium tho.

[theblacksmith]

I find not putting dents in your tailpipe works better than anything mentioned above