momken a3rf chm klft ma3a el x pipes ?mashkoor,
I amnot sure what you mean with Stage II, but you definitely need the X-pipes for it to sound like that.
wow , thanks for the full details my friendIt all depends on what sound you are after.
We are all different so my input is to listen to some sound clips and go with what sounds good to you.
Here's my Tubi upgrade post:
Photos here: M6 Tubi Rumore exhaust upgrade - a set on Flickr
Here's video clip on youtube:
YouTube - BMW M6 - Tubi Rumore exhaust mod