SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO gutted for you Marco. You really deserved to be out there.
Noise issues are just the worst thing to fail for. Maybe worth looking for a new Exhaust or get it repacked.
If you fail at Combe, I think you WILL fail at Bedford mate
Exhausts do get louder with age

My old Mongoose failed the static and the driveby at Bedford by miles. I bought a new mongoose and that passed the static and only just failed the driveby. The H&S exhaust on there now is super quiet but then it fooking should be!
My Sierra was running great, very pleased how fast it was on 1.5 bar and road tyres.
2 Bar and Slicks for National day though