Inner wing open con about £100 you would have to source the bits.
I think DeMoNPauL has this set up so speaking to him would help if you fancy this type.
Or a uprated panel filter you'd be surprised of the improvements, my house mate has one in his Civic Sport and he can notice the difference when he has to put the standard one back in to service the aftermarket one. £65
ITG is what we use on the race cars. Good enough for MG sport and Racing and the only system designed for the ZS V6. Nothing wrong with others all will make a differnce however pound vs power ITG every time.