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Old 02-24-2005, 01:46 PM   #17
500whp.com
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Member#: 71884
Join Date: Oct 2004
Location: CA
Vehicle:
2003 Evolution VIII
FOR SALE-88 RX-7 T2-PM ME

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Difference between Spec 3, and Spec 4 is the Muffler! Spec 3 is a lot louder and have a little bit more power! The Spec 4 is build to fit in the street, it have a silencer build into it!

Piping is 76mm = 3 inch
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