Originally Posted by No1Piranha
FYI, re that sound you heard from the Evo. There's a little restrictor piece after the turbo that most tuners remove when they modify peak boost to eliminate the boost taper-off on the factory mapping. It's not a pop off or blow-off valve as it doesn't dump the boost, but it does restrict it. Evos whistle a bit once its removed.
Thanks-
I must admit that sound was very enticing. It just sounded fast, which is always cool. They sound great under a overpass, that's always fun.