For intakes, the mandrel bends help. For 3" exhaust, mandrel bends aren't going to do much and few places can handle 3" piping. Mine was done at Hendrick's shop northside, no mandrel bends in the exhaust for me. Call ahead and make sure they have enough as it is not a commonly asked for size.

Roy's Hendrick's Muffler Shop
(804) 639-9711
1700 Hull St
Richmond, VA 23224

Roy Hendricks Muffler Shop
(804) 282-2857
6309 Horsepen Rd
Richmond, VA 23226