Want to hear the Turbo spool, you need to go to a Turbo up (unrestricted intake piping) system of some kind. The BTG system is one the AMX1397 system is one also. You need to go Turbo up because of the silencer in the intake tube between the turbocharger and the air filter assy. Do that and there'll be no doubt about turbo spooling. Thats my 2 cents.
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Alan
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