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Could be, whats happened to your screamer pipe? It is still there or have you got the wastegate outlet going into the down pipe now?
I always find exhaust leaks, even small ones make cars sound crap...
still waiting for intercooler to turn up mate so still running without external wastegate coz of the pipe ive made up to run without intercooler is in way. it just sounds shit when you get to about 3k revs an up its not deep at all