I’ve just finished putting some bass ports in my fog surrounds, it’s really easy to do.
I bought the bass ports from eBay and I’ve also got some neoprene 102mm ducting which i was going to run from the back of the ports to holes cut in the arch liners.
Having put the bumper back on I’m not going to bother with the ducting l don’t really see much point, I think it’ll do just as good a job without it and the front arch liners are so weak and flimsy it’d only be a matter or time before they disintegrate anyway.
I’m just going to leave the liner off and fabricate a plate like the ones in the picture to direct the flow of air to the brakes.