hey guys, so ive bought an exhaust valve, Sorta like varex system where you can open/close the valve for louder/quieter sounding exhaust, this though connects through the exhaust system and has a valve which opens to the side so you could add a side pipe etc... when your on the track open up the valve and you have a sidepipe without ruining your current exhaust.... now the only thing is where should it go? ill need enough back pressure for the thing not to run like a pig so im not sure if it should go before the Cat with a 3" pipe to the back or after the cat/resonator -