Ultra Light Muffler The performance Straightline is known for in a quality polished stainless steel muffler. Rethinking standards in performance and quality, with a corrosion free for life material. Simple installation and no jetting requirements. Produces mid-level volume designed for off-trail mountain or race applications.  The Ultra-light muffler is the best bang for the buck bolt on muffler on the market.  No one compares to a full polished stainless steel with guaranteed performance, dyno tested results.