Comments by "EarthSurferUSA" (@EarthSurferUSA) on "The Car Care Nut"
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I will bet you money that in that older car, the catalytic converters are further away from the exhaust valves than in newer cars, (which are now as close as possible.). I suspect that the 2010 Lexus was made with good quality, but I know the cats are restrictive, and being so close drastically raises engine temps. I also know the EPA can care less how long your internal combustion engine lasts, and does not want it to last 300,000 miles. I build race engines for a living, and I know, on my dyno, that if I restrict he exhaust just a bit, engine temps go flying up, especially at higher rpm's.
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