I got an email from John from Waldron Exhaust who manufactured X pipes and Y pipes starter and full exhaust kits for classic inline. He told me a Matt Cox from vintage inlines is now carrying the same design exhaust parts classic inline had. I guess he bought rights to patent. Maybe to other stuff classic inline had... Not sure but exhaust stuff he will take orders and Waldron will make and drop ship to your homes.
If interested email him at info@vintage inlines.com
If interested email him at info@vintage inlines.com