I have the titanium Akrapovic can on my Gen 1 (Race) and it is fine for noise due the volume of the silencer. They are well made and I have had no problems with mine and I would buy another in a heartbeat.
Your only problem would be for MOT as they are marked not for road use. I ground and polished the wording out and have had no problems.
Oh yes chaparral is correct the old bill will nick you if you leave the wording on and can be funny if they don't find the BS or kite marks