i have one on my '70 1.8 D-Jet ...
good quality. the original black paint won't last a week, i repainted it with heat-resistant paint (home depot) and that works well. performance seems similar to the bursch i had before. sound is different from a bursch, maybe a bit quieter, but has a nice roar at higer RPMs ...
most people don't realise that the 2 exhausts are actually connected (open) in the middle where the 2 tubes touch each other. which is a good thing! performance wise ...
Andy