Does seem like the back box mod is the way to go then. The other options from What I can tell are expensive for the small gains.
Do you get any droning on the motorway with the back box mod or all normal with the flap closed?
Hi, I’ve had my A90 just over 6 months but whilst I love it, it definitely time to try and get a little more noise, but nothing too crazy. My car is a 22MY and it seems a lot quieter than the early dealer demo I drove.
Has anyone got any experience with any of the cat/OPF back options in the UK...