The intake part of this throttle size is 4mm larger than that of original so intake efficiency is 17% up of the original. Butterfly size is 2mm bigger than the original this makes intake efficiency 8% up as well. Interior of the body part is polished by diamonds and mirror worked. This product is electronic. DO NOT install it with a wired accelerator. Makes about 2mm space if you install this to FN2 stock intake manifold so it's better to use with Spoon Sports intake manifold
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