The Tial is for more than just sound. It safeguards the system. Think about how much air it is producing at 7500 rpms and then the throttle bodies slam shut but the supercharger is still producing all that air the engine was ingesting...it has to go somewhere. The Tial allows it to escape properly without it surging back into the head unit causing premature bearing wear/failure.
To quiet it down you place a filter on it. There was a recent post and even a link for it in the A2A thread. I had done this to my car way back when I developed the kit and it works pretty good. If you want even quieter then you run a 1.5" hose from the Tial exhaust flange routed to inside the engine bay then place the filter on the end of that. The engine bay does a good job of trapping the sound in instead of purging it out directly off the bumper.
However, I dont think many guys are complaining about the sound and almost all the time guys PM me and tell me they love how this kit made their car sound versus the stillen setup.
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