The Header Test
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Tri-Y headers use a more elaborate collector design that pairs different tubes together to create a stronger scavenging effect. The headers are more expensive, but in the right situation they are worth it. View Related Article
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Audi A4 Research
Experience no-haggle car buying when searching for a new car, and research all vehicles such as the A4 Sedan. With available rebates and prices, you can find a new A4 for $31,450.00. It has had 0 vehicle recalls, which can give you an idea about its reliability. You also might want to research the Chevy Corvette and the Ford Shelby GT500.
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