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The LS3 has two ways the catch can be hooked up as opposed the one way for L99's. You can vent either:
1) the entire crankcase by plumbing the catch can inline between the driver's side engine rear to the intake manifold (the same method for L99's), or
2) just the valley by plumbing the catch can inline by removing the oem plastic coupler that runs from the valley to the intake manifold (cannot do this on L99's).
Wish I had the link that I got my pdf instructions from.
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