When you say exhaust shop, is that an auto exhaust shop? I'm looking at making some pipes for my sl and at the current time I'm considering using Cone Eng parts and weld them up myself. The problem is that they don't stock standard bends for 1 3/8 which is the closest to the metric and I'll have to either find old pipes or fab the exhaust port end. What oversize pipe are you using?
'14 NC700XD - Honda, '06 DR650 - Suzuki, '83 650 Nighthawk - Honda - for sale, '71 SL 350 - Honda