AFAIK turbo mods don't need to be engineered as engineers certificates are for ensuring safety for the car only. Just read it here: http://www.performan....php?t=67239791 -not sure if this is true or applicable to my state.
I know the boost controller wouldn't be legal as it means you can adjust the performance by more than 15%, although as long as it's hidden I doubt it would be a problem.
Why would you need mesh in front of the intercooler?
Emission and noise tests can be done anywhere and has got nothing to do with an engineers certificate???