We tack welded the mandrel-bent elbows together while checking for correct fit before final welding. We used a combination of 45- and 90-degree elbows to fit the converters in place. Hooker makes a set of tubes with the 90-degree bend, but they are a little long for the Corvette application. They also decrease ground clearance. Since PSA has been lowered, we wanted the pipes as high as possible.