Re-take for Mod 2 Progressive.

[nicomallourides]

So start of april i had my A category progressive tests and had no issues with mod 1, however failed my mod 2 as there was a sign that said max speed 20 and a corner icon on top of it, however it was bent so i didn't acknowledge it, and thus went 20 in a 30. My course (whom i paid £772 for a mod1+2 3 day course) is wanting to charge me £350 for a retake. I do have an R6 and a CBR650R, and have now learnt that i can take the test on my CBR after another course advised that i could technically do it. I am fully insured on my CBR (restricted), but it does have an exhaust. If i were to go to the test centre, would i run into any issues with the exhaust? The instructor i spoke to said that they wouldn't look into if it was unrestricted etc just if it had valid insurance etc. Any advice?