Check out this!! posted by kamikaze on June 01, 2001 at 07:48 AM
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If you want to run open pipe, Just put a y (shaped like a sewer sanitary y) in front of the cat, and a flange with a plate on the end. Requires under the car unbolting of the plate to open the system, but no closed system flow changes.
Rodders been puttin stuff like that on cars since the 40's.