Keep it Copacetic
Join Date: Feb 2004
Location: St. Louis, MO ||| Los Angeles, CA
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The primary reason for a botton mount is it's easier and cheaper. It's easier to mount it lower because it can drain directly into the oil pan as it sits next toit. And in most cases an extra oil pump isnot needed. Another reason, and usually the main reason is cost. The botton mount manifold is widely availible and easy to fit. Top mounts are expensive, custom, and very intricate. They have many weaves and require extras to help keep the engine bay cool. Also, sometimes structural modifications are required, primarily to the passenger side shock tower to help the manifold fit.
1995 BMW M3 Turbo - Dakar/Black