Check for any leaks, may have pressure loss some where in the system. I'll see if I can come up with any other causes for this.
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Cold Air Intake
MIZU Aluminum Radiator
Ralco RZ Underdrive Pulley
NGK Wires and Plugs
Hi Flow CAT
MR Muffler
Super Coil
Techna Fit Brake lines
Clear Corner Turn Signal Lens
Projector Head Lights
Evo Fog Lights
Evo Body Kit
Soon ---> 3'' Exhaust 
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