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The Factory 4.1 slip-on mufflers and full exhaust systems are FMF's premier ATV exhaust. These products boast titanium construction with durable stainless steel mid-pipe. They produce more horsepower throughout the entire RPM range, guaranteed. These systems are perfect for track or sand dune racing. If you're looking for performance, the Factory 4.1 slip-on is for you. FMF Factory 4.1 slip-on mufflers and full exhaust systems are available in a natural titanium finish and can be used with Powerbomb or Megabomb, or stock headers.