monaco blue 172 ..
just removed my accoustic valve ,replaced with a new air feed to the lower wheelarch liner (the cut out ), took it for a quick spin ,and the only differance i can see is that its a LITTLE louder under acceleration and ever so slightly quicker on the set off ,and i mean a little !!! thought these valves were for noise regulations ,what a load of c**k ... even considering putting it back on !! cos not that much difference peeps