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This is specifically for the Oval port and 90mm throttle body for LS1/6 engines. You can see the difference in shape and size from the stock on the left to the Oval on the right to the 90mm on top. First the stock intake snout is cut off, and the new piece is affixed to the intake. Then we machine out the intake to match the oval or 90mm port. If you look at the what's new on our home page you will find several dyno comparsons.
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