I’ve read a lot about different variations of the fluttering that comes from the turbo or bov. And everything that I’m reading is seems fairly normal. I have no engine mods. I only have a invidia down pipe and exhaust. This is a stock 2.0 wrx and my flutter only happens when I start off the line and maybe a little heavy on the throttle. If I take it easy, keep the rpm’s down there is no flutter. It doesn’t matter what gear neither. In neutral I get the normal flutter of the bov. I had a friend tell me to try and get an adjustable fuel regulator cause with my down pipe, it’s screaming for more fuel. Is this something I should look into? This is a daily driver project car that my son and I built.