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I have a 62 mm bored out throtle body also, mine does not whistle either, never herd of one doing it.
 
How much HP gain? I heard like 3-5hp. Besides butt dyno, anyone actual dyno it ?
 
I have been considering it too. I have a stroked 4L and looking to help it breath better. Do the spacers really make any type of difference? I have heard that it doesn't.
 
DirtMonkey said:
I have been considering it too. I have a stroked 4L and looking to help it breath better. Do the spacers really make any type of difference? I have heard that it doesn't.
Heard the same
 
spacers

A spacer is pretty much worthless unless you feel a psychological boost running one. I've run with and without with no noticeable difference. It really does nothing for redirecting or smoothing airflow since the air is immediately disrupted at the first turn in the intake.
 
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