[Fender0122]

Hey sometimes youve gotta use what you gotta use. I used a gatorade cap to temporarily block mine off so there's no need to knock the guy for wrenching around. If it works then try to make it look pretty later

Its all about the volume of that bottle, and the location/distance from the throttle body. The volume is meant to dampen shockwaves from the valves opening and closing. Doing so aligns the waves to be more in sync with the rpm's at a certain range. Changing the volume of that tank basically changes what rpm the torque hits

Its basically the same theory behind the design of the intake manifold plenum and runners. You have a ton of different variations in runner length and plenum size depending on the build of the engine, way its driven, etc.