Throttle body spacer.

[bartmanS4]

It's my understanding that these provide a trade off that gives you better performance at higher RPMs but not quite as good at lower RPMs. This is also what is shown in their dyno graph inset with the benefit coming in around 5300 RPM. Since I rarely go over 4k RPM in my VX this would likely have a slightly detrimental effect on performance for me. Think of a turbo lag but not quite that noticeable. If you spend a lot of your time in the upper RPM ranges you'd probably see some benefit.

[circmand]

It's my understanding that these provide a trade off that gives you better performance at higher RPMs but not quite as good at lower RPMs. This is also what is shown in their dyno graph inset with the benefit coming in around 5300 RPM. Since I rarely go over 4k RPM in my VX this would likely have a slightly detrimental effect on performance for me. Think of a turbo lag but not quite that noticeable. If you spend a lot of your time in the upper RPM ranges you'd probably see some benefit.

I even understood what you said.