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I got them both from Airaid. Just wakes up the engine and you can hear is pulling in air. I DO NOT HAVE EXHAUST because I want it to stay quiet inside.
i put a airaid throtle body on my 07 yukon and when u punch it you hear a sound like a turbo charger sound.. you hear the air going in fast when you punch it..
Yeah, throttle body spacers do not have any performance gains for our engines. The same goes for headers alone without any supporting mods (intake+exhaust+tune).