Opening the exhaust will generate noise, no matter how you do it. G56, AR Stage 1, or bore out the front and maybe rear baffle. I have the AR Stage 1 and it is loud but combined with the Stealth air cleaner with its trick Venturi stinger it goes really well. Get ear plugs. Leave the cats and you will have no codes.

2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)