Yep they add nothing. Most loose power.
I only had a vr6 for the noise it made and the simota is a great megaphone along with 6 branch decat and straight through 
Well i havent put the snorkle into the airbox and was thinking of fitting a cai to the factory airbox. Dont realy want to butcher the airbix buy doing the cheese mod lol tbh.
The best positive thing we had yesterday was hear the BEAST fire up then cut out lol. My mechanic said f*ck me this sound too good. It has a 2.9 inlet or throttle. Just waiting for the transponder box so i can get her warmed up. It has a jetex decat, i got hotgolf to lighten a flywheel for me aswell

we changed the oil and filter last night.