Fits JKU 2010 and no whistle. It was very tight. I didn't notice any performance gain. The only reason I bought this throttle body is because I also bought an Airaid CAI and tuner kit and was hoping to get some extra horsepower on my 2010 JKU. hp DO NOT make the same mistake as me. $50 for (2007-11 Jeep Wrangler 3.8L V6 Red Aluminum Throttle Body Gasket). It looks identical to the Airaid PowerRaid.
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