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i am considering SpecialtyZ's custom manifolds as the final piece to the considerable upgrades going into my car. Other than Gregs original post, are there any other members that have used these? How much of an improvement with respect to HP, Torque and most importantly to me, Lag did you get? Was it worth the cost? I know they are still a new product but how are they holding up wrt durability? Any comments would be appreciated.
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