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I don't get it, IPD changed their plenum from smooth interior surface to a rough one, apparently for better air movement, and here the smooth hose is supposed to be better than the corrugated one. There seems to be competing theories on the use of smooth vs "unsmooth" surfaces for air intake.
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07 Targa 4S; GT Silver, X51 headers, PSE, AWE Cats, SSK, Champion RG5B
05 C2S Cab: Triple black: Sold
05 C55 AMG: Sold
01 CLK55 AMG: Sold
57 Thunderbird: Very red. Sold
70 MBZ 300SEL 6.3: True sleeper. Stolen
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