Hi,Is there anyone out there who has had any experiences with Motad Mufflers?I am looking at obtaining one to replace the factory unit on my 1992 K100rs 16v. The Motad web site indicates it would be a straight swop over. However I notice some after market units require "Brain" chip replacement or other small adjustments to retain to gain performance. Any observation, guidance or advice gratefully received.Rgds to all.