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CAR SDUND E WkUST CATALYST EFFICIENCIES. <br /> Catalyst efficiencies are obtained after an aging <br /> process consisting of a 250000 mile mileage acaumnlaticn, <br /> as specified by O.S. EPA procedures described in Federal <br /> Register Vol. 51, No. 150, dated Tuesday, August 5, 1986, <br /> and titled 'SALE AHG OSS OF C <br /> CCNVZH=RS0. At 25,000 miles the catalyst is tested to <br /> obtain Frith-catalyst (w/c( emission levels., then the <br /> catalyst is removed and replaced with a simulator which <br /> provides equivalent exhaust backpressure characteristics <br /> under normal road load conditions. The vehicle is then <br /> tested to obtain the without-catalyst (wo/c) emission <br /> levels. The catalyst efficiencies are determined using <br /> the following formula: <br /> 6 catalyst efficiency = ( NO/c - w/c) / wo/c) X 100 <br /> The following catalyst percent efficiencies have been <br /> . obtained for E.P.A. and A.R.B. approval of Car Sound Exhaust <br /> catalysts in the United States: <br /> SERIES SC CO NOX <br /> 500 86.2 83.6 89.2 <br /> 800 81.0 85.0 63.8 <br /> The tests were performed at the Olson Eng�� riaq <br /> Test Laboratory. According to the Q.S. Federal Teatiag <br /> Procedure (CFSII) , results indicate that each of the Car <br /> Sound Exhaust 40-0- And 90-0 -shies COn rm=tgwz <br /> most the stringent efficiency requirements of the Air <br /> Resources Board (A.R.B.) and of the O.S. Env"- MWntal <br /> Protection Agency <br /> • <br />