heres a dyno comparing it to a magnaflow high flow on a lancer evo and shows almost no performance loss from the spring loaded valve.

a great discussion about the muffler on lancer evo's http://forums.evolutionm.net/evo-engine ... ffler.html" onclick="window.open(this.href);return false;
my second choice is the super turbo. from what ive read about that it gives a nice deep sounding exhaust while remaining relatively quiet.
from how loud my exhaust has been for the past year and a half im ready for it to be as quiet as possible so i think im leaning more towards the vt. my only problem is the only reviews ive been able to find are for large displacement cars/trucks and high powered turbo motors. im not sure how well it would workout for the k8 i have now, or the de/ze i plan on getting in the future so was wondering if anyone has seen/herd these in person? and if they live up to there claims/hype...