<br />FMF FMF Titanium PowerCore 4 S/A Muffler &amp; Stainless Steel Megabomb Header for YAMAHA YZ450F 2006 <br /> <br />FMF Titanium PowerCore 4 S/A Muffler <br /> <br /> <li>Value-priced performance.</li> <li>Completely American made using American materials. 100db sound level.</li> <li>Includes a removable spark arrestor.</li> <li>Optional quite-core insert available separately</li> <br />FMF Stainless Steel Megabomb Header <br /> <br /> <li>Produces long header torque and short header over-rev. Reduces sound output as much as 1.5dB. </li> <li> Made from premium-American material</li> <li>Patent pending technology</li> <br /> <br />Kit Includes: 1 Titanium PowerCore 4 S/A Muffler, 1 SS Megabomb Header