Not really any hissing noise from mine. i do get a little half second hiss when i first tap the go peddle.
Well you are ment to put on the heat sheild before anything else but i guess you can work around the pod.
It's only there to stop the heat from your engine. But i guess if it's a cold day and your driving, the cold air would blow the heat away "maybe"
Just had my V on the DYNO again but the readings were not good. Ownly because the V's need time to adjust to the new settings. I had a before test from a month ago 163kw on the wheels then put my spacer on and got 170kw, put the new intake on and got 153kw on the first go "WHAT IS GOING ON?" second run 163kw, next 168kw, next 171kw, next 174kw, next 178kw, then i stopped it was getting late. So the V needed time to adjust. I will go back to the DYNO next week after the car has had more time to adjust.
The sound is wicked cool. I still got my standed exhust (i don't want to change it)