Post by
BuudWeizErr »
https://forums.nicoclub.com/buudweizerr-u1639.html
Sun Jul 20, 2003 4:19 pm
smog doesn't measure the amount of crap coming out of your exhaust, a common misperception. It's the percentage and PPM.
That valve only limits the sound, and also, your turbo will not go into boost if you have that thing set at more than a certain angle.
Richard Tang, aka JDM RICE had it on his car. It did make a lot of difference, because his exhaust was loud as sin; straight pipes with a T3/T04E.