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I bet if you did switch over to a REW manifold and port matched it I would not be surprised if you pick up extra HP for your beast. It really helps the air flow smoothly go into the ports with the least resistance. I guess in the S5, S4 UIM the air gets crammed into the manifold, then the air has to make a climb up the manifolds ports. lol I hope that makes any sense, but I have no hate towards any rotary setups as long as she screams...right. I just happened to be a die-hard 13B-RE loyalist.
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