I have a 2005 330ci with dual exhaust pipes running from manifold to exhaust tips. I'm thinking of designing a system with an electronic valve in.
Where the mid box is, I'd like to replace this with an x pipe (Exhaust Stainless X Pipe Section Divider 2.25" 57mm | eBay)
Then one of the exits will go through to the back box and the other will have a valve (QTP QTEC225 2.25" Electric Exhaust Cutout 3-Bolt Flange -Quick Time Performance | eBay) and a short piece of pipe with a turn down fitted .
My question is, will the restriction of going from 2 to 1 pipe make it quiet enough for normal cruising? My thought was, this would be similar to the center box. I dont want too much drone when motorway driving.
Thanks in advance.