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These Full Blown Motorsports 72mm Billet throttle bodies were designed to increase flow and eliminate the bottle neck restriction when going to larger intercooler piping and bigger turbos. The OEM throttle bodies can be quite restrictive on higher power setups.
Modeled after the OEM design, FBM was able to increase bore diameter while keeping a sleek design. They also opted for a brass throttle plate for its strength compared to aluminum.