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!!???