Gents. My 2006 Z4M was traded recently for wife's upgrade and have available a SuperSprint Exhaust Cat Back with dual stainless steel tips. Exhaust was purchased in Aug 2011 and has less than 3000 miles on it and is excellent condition. Purchased brand new as noted below:
Supersprint BMW Z4 M Coupe/Roadster Powerloop Muffler $2,576.20
http://www.eurosportdesign.com/c-117-z4.aspx
Supersprint systems are handbuilt in Italy and custom ordered and shipped to the US. This system is now available for purchase. Sale price $1600 + shipping via UPS. Will consdier all reasonable offers. Pics and sound clips attached. Great muffler and great sound for your open car/roadster. Makes this car come alive. Contact me via PM or email at
mdrobc13@msn.com