Love mine I had the SS version on my 23 stock cats and did the valves to vacuum lines.... then got a 24 went titanium haha yeah yeah lol with gt haus high flow cats and holly shit its loud love it did the valve to as well this time I bought the valvetronic vacuum box , powered it with aux 3, when no power to it its open aka loud when there is power then close .... made it easier and simpler and put under the rear seat box .
this way you can start it in quiet mode but I don't like too ... because the box will hold a vacuum and not reply on the engine for a vacuum .... just fyi