I did both at the same time on my S70. I got the improved throttle response and no change in MPG.I was planning on doing the intake mod.
As far as the 960 throttle mod. I have not read up on it. could you provide a link??? preferably with a walkthrough?
I live in FL so im sure the flap removal wouldnt hurt my car.
Here is a lengthy thread about the throttle plate. Enjoy
https://www.matthewsvolvosite.com/forums ... =1&t=19204






