Some JRSC M45 come with an idle air check valve that mounted in the 3/4" bypass hose. This check valve is good for about 0.5 PSI of boost. If you do not have one in your setup it would be worth the addition. These units use a small rubber flap that wears out in time.
Code:
TDR-CHK-VAL Price: $25.00 Delivery: Usually ships within 1 week