I put a K&N Intake and a Rugged Ridge Throttle Body Spacer on my 1998 TJ 4.0L today
I went for a pretty long test drive...and noticed an intermitten whistle
My guess is its not a big deal, but im wondering if anyone who has installed these items on their jeep has had the same whistle, and how you got rid of it?
On a side note, my intake didnt install exactly how the directions said. The heat shield was supposed to bolt to the radiator, but my radiator didnt have the mounting point the pictures in the directions did, and the bracket wasnt long enough to unscrew a bolt from the radiator...put the bracket on there...and retighten screw
Instead i have the heat shield attached to a bracket with a 3 or 4 inch screw (see pic)
(the end of the screw just has some tape on it...because i didnt have a self locking nut...and i didnt want the nut to vibrate off)