Hi all I have finally finished fitting my new exhaust system which I will write up at some point when I have a video.

Anyway it is valve based so you can have it LOUD or marginally louder than stock.

The problem I have found is that if I have it on the quieter mode it is quieter until about 4000rpm and then seems to get loud.

I have T’d the vacuum line to the supercharger actuator. At 4000rpm + would there be any vacuum left as I’m suspecting not?

If not is there somewhere that always has vacuum?

I considered T’ing into the brake booster but can’t work out how to do it safely as I don’t want to lose brake of the vacuum line chafes or something on the way to the back.

Any idea? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF