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The $45,000 Exhaust Pipe Test - Individual Rider Ratings of The Dirt Bike Pipes2006 Kawasaki KX450F and Honda CRF250R Exhaust Pipe Comparison From the February, 2009 issue of Dirt Rider Photography by Karel Kramer
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| 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 | | | | | | | | | | | | | | | | | 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 | | | | | | | | | | | | | | | | ** Denison's ratings were not averaged into the test | | |  Burning laps on the Honda...  Burning laps on the Honda.  And the Kawasaki.  The rider in front read the...  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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2004 Kawasaki KX 250
Big Big bottom. The new KX 250 has gone back to the days of big bottom end power. It hits hard on...
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2005 KX450F
So far what Kawasaki has released is that the new machine's 449 cm3 DOHC 4-valve engine is housed...
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