E46 M3 Headers and Exhaust by Boris | Nov 20, 2014 | BMW service, News, Performance | 0 comments Our customer installed headers with full exhaust along with a custom dyno tune and gained over 35whp. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.