Boost activated exhaust cutout on Ecoboost Flex
 

Not a truck I know but this would work the same on a truck. I want my car quiet 99% of the time and loud when I want it loud. Drone SUCKS!
:)

https://www.youtube.com/watch?v=48WlWGK2o9E

Is it activated by boost level or by remote from driver. Buddy's z06 has remote cut out tha he says adds 10-20 hp.

It's completely boost openned, I can stop it from openning or let it open automatically starting at 6psi and fully open at 11 psi.

Mike looking at it it does not seem like its open enough most of the time ? why not just open it up fully when you want 1/3 open cant be helping that much at WOT.

More boost = more openning.
Bigger turbos = more boost...
:)
I need to order my 3 bar MAP sensor on Monday from Torrie so I can get more boost out of the factory turbos.
I've figured out a ton this weekend for fuel and E85 mixing.
Lots of good things coming soon!
As far as the cutout open it makes about a 20-30 HP difference, it's quite a bit.