Cool decat

[Petrus]

and be dóne with it 

Not if you want to pass MOT and not be constantly fined by cops. ;-)

Well you cannot both have your cake and eat it no?!

The MoT is very simply solved. Ok, not with thát manifold ;-)
The noise can be kept somewhat in check with sóme muffling and sensible use of the loud pedal. Concerning the latter, one should drive sensitively in built up areas anyway.