side exit exhaust

I was looking at Jeg's cat. this morning, WOW! the price of mandrel bent 90 ad 180 degree 2 /1/2 in pipe. I have access to a local exh shop but like most of them, he can not do a mandrel bend. No doubt this needs to not be pinched in those hard turns. Most F body guys will be the as tank over run tail pipes between tank and frame. Seems like pretty close to the gas tank to me!!???
had a shop make 2-1/2" tail pipes for a A-body. one ended up being 2 piece but was gorgeous...cost a case of beer.
another shop would plug the end of the pipe with an expansion plug, fill with sand and the plug the other end before bending. maybe if you tell them about that method, they could give you the "practice" pieces.