i just installed a k&n cold air intake with an Airaid throttle body spacer and it seems the TBS causes the intake tube not to line up correctly because of the additional space added to the throttle body. I was still able to get the clamps on with a decent seal... i think... but i get a whistle from the filter box area and the check engine light came on after driving about 15 miles. The tube isnt lined up perfectly with the throttle body/filter box but it is inside the boots and clamped tight.

Any ideas.... although i think ill just send it back to amazon...

2011 silverado, 5.3L