Thread: variable exhaust?
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Old 12-21-2010, 04:31 AM   #5 (permalink)
pounsfos
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Laura the Lancer - '81 Mitsibishi lancer LX
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it closes the butterfly vavle at low cruizing loads to improve low end response (as you now have more back pressure so gasses escape easier compared to a bigger exhaust)

sorry ment higher velocity
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