hey guys my cars boost drops from around (13.8)14 psi to about 8psi after i hit around 4 grand
anyone got any ideas? I've just put a brand new AFM on so its not that

Mods on MY00 Limited GC8:
-3"TBE
-silicone turbo pipe
-apexi pod filter

any help would be greatly appreciated

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Winning the award for slowest build in history.