This system is not road legal because the replacement pipe does not have a certificate and is therefore not approved under the StVZO. However, other components such as the rear silencer do not require registration with EC type approval. 150 kW / 204 hp. Stainless steel racing system from cat BMW Z4 E89 Roadster 2x80mm double-walled Product type:Racing complete system from cat Tailpipe:2x80mm round double-walled 15° bevelled Appraise:without certificate (not approved under the StVZO) 1 x Fox stainless steel sports exhaust BMW Z4 E89 Roadster 2x80mm round double-walled bevelled 1 x Fox stainless steel pre-silencer replacement pipe BMW Z4 E89 Roadster Attention: This FOX rear silencer is only suitable for use on models with standard bumpers; the usability on M-Technik bumpers has not been tested This system is not road legal because the replacement pipe does not have a certificate and is therefore not approved under the StVZO.