I guess it is a racing one, sounds like a good overtaking modification to me. Desperate to get it done but this winters first jobs are to sort the interior out completely, sound proof, recover dash etc. I did put the new floor dead mat in - used Dodo Mat which was a lot cheaper than Jons recommendation but has worked a treat underneath the carpets, a lot quieter now so doing on the front engine cover, in doors and front panel combined with regular sound absorbing material - be quiet as a mouse in there I reckon