where is a good place to get 3" mandrel bends and pipe?

jegs and summit sell some, i dont know if its listed in there catolog but u can call up and ask them.

This place has got them, and I think they'll bend anything you want too. I've used a box of their 'mistakes' to custom build a set of headers before.

www.stahlheaders.com

Lots of exhaust tubing!

I've bought 3" mandrel bent from my local NAPA. Don't know how the price compares, but I didn't pay shipping on it, though.

I got mine at JC Whitney. The 2.5" were about $15 each for 180 degree mandrels, I think the 3" was at least $10 more. Those are for 16 gauge aluminized steel tubing, not stainless. I couldn't tell you how much shipping would be, I drove the hour to pick them up

Check out their website