Originally Posted by Mr. Grumpy
Please keep us informed on this mod. I've been thinking of switching to a 4" Crome tips and replacing the center silencer (resonator) for a cross pipe for a better exhaust sound.
2016 BMW F10 550xi - 4.4 L 330 kW (445 hp)
2013 BMW F10 535i - 3.0 L 221 kW (300 hp)
2007 BMW E64 630i -2003 BMW E65 745i
1995 BMW E34 540i -1989 BMW E30 M3