The $45,000 Exhaust Pipe Test - Individual Rider Ratings of The Dirt Bike Pipes
2006 Kawasaki KX450F and Honda CRF250R Exhaust Pipe Comparison
photographer: Karel Kramer
KX450F | KX450F | Keefer | | Lewis | | |
| Pipe | Perris | Glen Helen | Perris | Glen Helen | |
| Akrapovic Evolution System | 89 | 84 | 77 | 78 | |
| Bug Gun EvoR with Vortex | 82 | 81 | 86 | 93 | |
| DEP System | FAIL | | | | |
| DMC Afterburner ProQuiet System | 84 | 85 | 88 | 88 | |
| Dr. D Carbon Race System | 89 | 88 | 88 | 85 | |
| Dr. D Stainless SA System | 89 | 89 | 90 | 92 | |
| FMF Factory 4.1- Megabomb Header | 88 | 89 | 92 | 88 | |
| FMF Slip On | 90 | 85 | 88 | 83 | |
| Hindle Slip On | 78 | 78 | 78 | 75 | |
| Hindle System | 81 | 76 | 85 | 82 | |
| Jardine | FAIL | | | | |
| PC 496 Slip On | 78 | 82 | 88 | 89 | |
| PC Ti4 System | 85 | 85 | 75 | 84 | |
| Stock | 86 | 86 | 86 | 86 | |
| Two Brothers M-7 | 89 | 87 | 89 | 86 | |
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| CRF250R | Armstrong | Orr | | Denison** |
| | Perris | Glen Helen | Perris | Glen Helen | Perris |
| Akro Dual | 88 | 85 | 94.5 | 93.5 | 86 |
| Akro Single | 89 | 90 | 83 | 94.5 | 83.5 |
| Big Gun EvoR with Vortex | 89 | 78 | 78 | 78 | 85 |
| DEP Twin | 98 | 97 | 96 | 95.9 | 89 |
| DMC Single System | 89 | 81 | 95 | 89 | 88 |
| Dr. D system with long core | 93 | 89 | 95 | 94.5 | 84.5 |
| Dr. D system with short core | 93 | 93 | 94.5 | 94 | 85.5 |
| FMF Factory 4.1 -megabomb | 91 | 89 | 93 | 94 | 87 |
| Leo Vince Twin System | 85 | 92 | 90 | 95 | 80.5 |
| Pc Ti4 Single system | FAIL | | | | |
| PC Twin Ti4 system | FAIL | | | | |
| Rocket | 89 | 84 | 90 | 95 | 82.5 |
| Stock | 88 | 88 | 88 | 88 | 88 |
| Two Brothers M-7 System larger insert | 96 | 92 | 93 | 94 | 85 |
| Two Brothers M-7 System Small insert | 92 | 85 | 82 | 84 | 82 |
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| ** Denison's ratings were not averaged into the test | | |
 Burning laps on the Honda. |  And the Kawasaki. |  The rider in front read the Dirt Rider pipe shootout. The rider in back read one of the 'other guys' pipe shootouts. |
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