i have missed placed the place i was going to use to buy some 4" tight radius bends, and i can't find the place that sell the 4" metal donuts. i think they would work best for what i need. any one have any ideas? i know the street rod bunch uses the donuts, i just can't find'em.

 

well i found some on the otherside of the world. i know they are for sale in the states, but where in 4"

 

What do you use those doughnuts for? Exhaust?