AMD267 October 2021 Aftermarket Moto Design | Page 34

Pro Performance baffle - evolutionary 2:1 , 400 PSI stainless steel EPA assist emission support and noise reduction systems . Catalysts with metal substrates convert nitrogen oxides ( NOX ), carbon monoxide ( CO ) and hydrocarbons ( HC ) into carbon dioxide ( CO2 ), water ( H20 ) and nitrogen ( N2 ). High performance with higher oxygen storage ability ( OSC ) and stability by applying precious metals rare earth compound catalytic technology . Exhaust baffles are backward compatible and fit all BPE systems . They can be installed or replaced within five minutes . characteristic deep power sound of a V8 speed boat in water ." Blow Performance offers a choice of performance baffles for those who require a softer sound while still having that distinct Harley-Davidson throb . The company ' s 3-step headers are designed for performance and Dom says they are at their best without collectors , mufflers or baffles . Available in 3-layered showroom chrome and hightemperature resistant ceramic matte black exhaust pipes , there is a choice of showroom chrome , ceramic matte black and solid rose gold copper for the heat shields . " Our first primary length is close to the exhaust port . This prevents a sudden drop in velocity due to a volume increase from head port to the exhaust tube . The first step helps prevent reversion - giving power at low rpms . Steps placed further down the pipe create pressure drops in the flow of the gases and increases power at mid and higher rpms . " Specifically designed and calibrated for piston to valve synchronization , the pressure wave begins to travel down the tube . When it reaches the end of the tube , it reverses as a vacuum wave and comes back towards the cylinder . Our tuned headers time that wave to hit right around the closing of the exhaust port , this boost scavenges residuals out of the cylinder while the intake begins to fill - often cited but equally as often misunderstood , scavenging is the effect generated by harnessing the inertial energy of a high velocity exhaust gas pulse .

' Design , materials and coatings are everything '

" Misunderstood and confused with the pressure wave , the best performance exhaust systems have no back pressure . A high velocity pulse of exhaust gas carries energy . As the pulse moves through space it displaces the following volume behind it . " This generates a low-pressure zone like a weak vacuum . Scavenging effect is created , and a lowpressure area is left in the vacated cylinder ready for the incoming intake charge ."

Standard baffle - fibreglass , mesh filled for noise reduction , with mild steel casing .

Blow Performance does not supply map settings for its exhaust systems because , as Dom says , no two engines are the same . " Hence , for maximum performance , we encourage having your engine dyno tuned after installation by a professional dyno tuner . Every time you change air cleaner or exhaust , you really do need to retune the engine to get the best out of the new combination . " Aftermarket tuners are not needed , however , you can install any of the top branded products . What is important when using Blow Performance exhausts is a performance air cleaner and dyno tuning after installation . Air in and out with the right mix in the middle makes all the difference ." Blow Performance offers a 2-year full replacement policy - " we currently boast a 1.8 % failure rate , and that includes incorrect customer installations ." www . blowexhausts . com

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