Try to do this Dave.
I am going to do it when weather improves but for now I just retracted my cargo cover and it helped a lot. I was getting loud buzzing at around 3.5 to 4k rpm but now is good and acceptable for my ears lol. You can hear it just a little and for a split second but it is defo not annoying like it was before.
toyota supra
https://www.instantstreetview.com/@51.387311,-0.264197,292.89h,-11.89p,2.37z
ferrari gto 250
https://www.instantstreetview.com/@51.389408,-0.263674,15.4h,-17.95p,3.12z
I bought a resonated short tails from Torqen and just wanted to say thanks again.
Adrian supplied a good quality product and also organized fitting of it on a short notice at the garage next to his unit.
The exhaust sounds great, I am really happy with the outcome.
Adrian has a before and after video of both exhausts, which he might post on here.
Many thanks again!