Lound POP and no air coming out, take it back to where you got it re-gassed if the also do repairs etc as they should be able to find out what's wrong.

Doesn't sound to good though.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO