I think we can all agree there is a noticeable, and in my opinion a nicer deeper sound increase across all ranges, especially cold starts when this plug is pulled. I have it pulled on my car and def prefer the sound. The only part that weighs on my mind is the mystical "back pressure" argument that I have heard this can cause. While the turbos begin to spool the lack of back pressure can supposedly increase lag. Although I don't seem to feel any difference in my car, and believe this valve exists largely for sound purposes, I would be interested to hear from everyone else so I can stop thinking about it:
-do you feel there is any increased turbo lag when throttle is applied from 20 mph+
-do you feel any greater turbo lag off the line?
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