When STR rules changed to allow a header the GWR race single was too loud, so I recently purchased a street single that works great. I only used the race single for summer time autocross events, so the muffler was only on the car a few months per year.
Asking $100 plus shipping. I live in Portland, Oregon.
Please email me at brianc3343(at)gmail.com.
2006 Mazda MX5, Prepped for STR