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


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