Test On 16 Slip-On Exhaust Systems - Pipes Installed And Rated - Pipe Dreams

The OE manufacturers have to find creative ways to meet the ever-changing emissions standards that, much like gas prices, are getting tougher to stomach. Over the years we've seen numerous designs: long, short, under the seat, under the bike, dual sided, single-sided, and constructed from just about every material in the search to produce the most power while keeping the weight to a minimum and the emissions in check. As a result of all the research and development, the stock header pipes on many sportbikes have become very efficient, and adding a slip-on exhaust system has become a simple way to add mild power while shedding loads of weight and improving the appearance. Slip-on systems are also available in a wide variety of colors, shapes, materials and designs to meet just about anyone's taste.

Our test bikes included horsepower's heavy hitters-a 2007 Suzuki GSX-R1000, 2007 Kawasaki ZX-14 and a 2008 Suzuki Hayabusa.

All of the systems were installed in less than 45 minutes using basic hand tools, and run on a Super Flow Cycle Dyno calibrated to Dynojet specs.

Stock	Stock	Stock
FMF RacingFMF Racing has recently made a commitment to producing exhaust systems for modern sportbikes, and the all-new design features cool diamond-shaped carbon-fiber cans. Installation was quick and simple and made use of the stock catalytic converter.FMF RacingPrice: Prices VaryThe score:-13.54 lbs.+1.8 hp+0.5 lb.-ft. torquewww.fmfracing.com	Fmf	Graves MotorsportsGraves Motorsports develops pipes to make power first and foremost. With a 3.9-peak-horsepower increase and weight savings of almost 19 pounds, the Graves carbon slip-on is a must-have upgrade for the performance freak. Installation was fast after removal of the catalytic converter.Graves MotorsportsPrice: $569.99The score:-18.74 lbs.+3.9 hp+1.1 lb.-ft. torquewww.gravesport.com
Graves	M4M4 offers a MotoGP-style exhaust that not only has huge weight savings but also greatly cleans up the rear of the Gixxer. Installation was a bit tricky because of a relocated footpeg bracket.M4 exhaustPrice: $360.00The score:-19.26 lbs.+0.7 hp+0.1 lb.-ft. torquewww.m4exhaust.com	M4
Two Brothers Racing With a 4.2-horsepower increase over the stock GSX-R muffler, the Two Brothers system offered the most horsepower of the tested pipes. A detailed set of instructions made installation a snap. The system also includes a left-side exhaust-mount bushing replacement because the system converts it to a single can, which is a nice touch.Two Brothers RacingPrice: $499.99The score:-18.14 lbs.+4.2 hp+1.3 lb.-ft. torquewww.twobros.com	Two Brothers Racing	Hotbodies RacingThese pipes are very loud with no packing to muffle the sound. Clearances were tight, making installation a challenge, but the price is right if this is your look and performance matters.Hotbodies RacingPrice: $299.99The score:-12.76 lbs.+2.1 hp+1.3 lb.-ft. torquewww.hotbodiesracing.com
Hotbodies Racing	RemusThe carbon-fiber system looks like it should be light, but actually was heavier than expected. The sound is clean without being excessively loud courtesy of a removable insert.RemusPrice: $889.00The score:-13.18 lbs.+1.5 hp+0.1 lb.-ft. torquewww.maxmoto.com	Remus
YoshimuraAdded to Yosh's line of racing exhaust is the R-22 Bling pipe for the rider who wants performance and looks. Installation was quick and the chrome looked great against the Hayabusa.YoshimuraPrice: $829.00The score:-18.06 lbs.+3.2 hp+0.6 lb.-ft. torquewww.yoshimura-rd.com	Yoshimura	Boz BrosThe Boz Bros Gild Series slip-on is a wide, polished stainless steel can with a slash-cut tip that has a deep throaty roar. Close tolerances made for a tricky installation, but it had good performance gains and sounds great.Boz BrosPrice: $1054.00The score:-15.20 lbs.+2.3 hp+0.4 lb.-ft. torquewww.bozbros.com
Boz Broz	Competition WerkesCompetition Werkes' exhausts look and sound like they're made for the race track, with unpolished cans and thick, exposed welds. The sound is loud and throaty.Competition WerkesPrice: $695.00The score:-21.80 lbs.+0.6 hp+1.7 lb.-ft. torquewww.competitionwerkes.com	Competition Werkes
Hard Rock MotorsportsThe simple-to-install pipes bolt directly to the stock mid-pipe and feature tunable end caps that adjust backpressure. Small and compact, the pipes are just crazy enough to work.Hard Rock MotorsportsPrice: $625.00The score:-18.60 lbs.+0.2 hp-1.5 lb.-ft. torquewww.hardrockmotorsports.com	Hard Rock	HamaguchiThe Hamaguchi pipes feature a hand-made 'wagiri' method of forming tight-radius bends through the welding of smaller pieces to prevent backpressure. The pipes look like they were custom made and offer a deep, throaty sound.HamaguchiPrice: $625.00The score:-16.56 lbs.+0.3 hp-0.3 lb.-ft. torquewww.sudco.com
Hamaguchi	VOODOO MOTOVooDoo Moto's exhaust is designed to work with most aftermarket swingarms for fat-tire applications. Tolerances were tight, which increased installation time, but the huge weight savings and appearance enhancement are worth the effort.Voodoo MotoPrice: $625.00The score:-23.74 lbs.+1.3 hp+0.6 lb.-ft. torquewww.voodoomoto.com	Voodoo Moto
Leo VinceLeo Vince's SBK slip-on exhaust systems are designed to run at peak efficiency with stock fuel-injection settings. Included are quiet core inserts that keep the sound low enough to avoid unwanted attention. Minor power losses are compensated in the weight savings and great tone.Leo VincePrice: $743.00The score:-13.50 lbs.+0.2 hp+1.6 lb.-ft. torquewww.leovinceusa.com	Leo Vince	StaintuneLooking to retain a stock appearance but still want to reduce weight? Staintune's slip-on system for the ZX-14 comes fully assembled and features a beautifully polished elongated pipe. With minimal logos and a high-quality finish, they look and sound near stock with a slightly louder tone.StaintunePrice: $999.99The score:-13.14 lbs.-1.5 hp-1.2 lb.-ft. torquewww.cbtimports.com
Staintune	Bruce FabricationBruce Fabrication uses a squared-off can design with billet aluminum end caps, for a look that is unique to the market. A wide variety of colors and finishes make for a truly custom look. Removable cans added some installation time, but overall installation was simple.Bruce FabricationPrice: $625.00The score:-16.22 lbs.+0.8 hp-0.8 lb.-ft. torquewww.brucefabrication.net	Bruce Fabrication
KR TunedKR Tuned has taken the technology developed for the racetrack and applied it to the street. With the sound core installed an increase of .5 hp and 1.1 pound-feet of torque were gained, while removal of the sound core provided a larger jump in power of 3.1 hp and 1.7 pound-feet of torque. Both installation and core removal were quick and simple.KR TunedPrice: $1300.00The score:-15.44 lbs.+3.1 hp+1.7 lb.-ft. torquewww.krtuned.com	KR Tuned