I personally, have never seen a pro racer's vehicle use pipe. I believe there is a reason for it. Reasons like, pipe does not have as high of yield as DOM tubing. NASCAR does not use pipe, SCORE does not use pipe. If I took my truck to a shop and they bent me a cage with an exhaust bender, a pipe bender or used pipe on my cage or even HREW, I would throw freakin' fit. I'd be up their butt so far I'd tickle the back of his throat. No way in hell I'd pay for that crap.
haha i race dirt track cars so i know the rules, haha u should read the rules
http://oceanspeedway.com/Uploads/AmericanStockRules.pdfRoll cage material must be 1 3/4"o.d. round mild steel tubing by .095" minimum wall thickness or 1 3/4" o.d. black iron pipe by .125" wall thickness.
pipe is used on nascars.. only if u want to