Recently, I have heard that a throttle body spacer and a cold-air intake do not fit on a 5.3 without cutting part of the fan shroud. Is this true, and is a throttle body spacer/cold-air intake worth the price performance-wise? I was thinking about an Airaid TBS and either an Airaid intake or K&N intake. What do you guys recommend? Also, I heard the TBS sometimes makes a whistling sound. Does it sound cool like a turbocharger or is it just an annoying sound? Thanks alot, guys!