I took the side pipes to a very good muffler shop in town and had quieter glass packs welded in. Same inside diameter, same flow, just more packing. They're industrial inserts made by Allied. They are designed for commercial use in areas where niose reduction is required. The shop told me these would also last much longer than the ones it came with.
The inserts were only about $75 each. Total with labor was only around $200.
A forum community dedicated to Factory Five owners and enthusiasts. Come join the discussion about performance, racing, conversions, modifications, troubleshooting and drivetrain. We discuss MK4, GTM, 818, Type 65 coupe, roadsters, and more!