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Discussion Starter · #1 ·
Long story short, cold start... Boost is good, hits around 22 or 23 psi. After driving for around 20 minutes, boost only hits a maximum of 18 or 19 psi.

Mods are:
Cobb SF Intake
AMS UICP
COBB AP, stage 1 with SF
Catback exhaust.

Recently just replaced the radiator cap (due to coolant rising in overflow tank), replaced spark plugs, did an oil change, and replaced the timing chain. Also have replaced the fuel pump relay. Car is at around 79,000 miles. A bit concerned that it may be Exhaust Manifold, but maybe a boost look? Just not sure why it starts off boosting fine then lowers.
 
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