I’ve got to say, I am very happy with that little 6mm phenolic spacer. The car is definitely more responsive to the pedal. When I took it out after I had done the update, I thought it pulled quicker but wasn’t certain. I had it out this afternoon for a while and now I’m certain there are tangible improvements. It revs a little quicker under load when you put your foot into it. It’s noticeable and the intake sounds like it’s more open when you’re on the throttle (if that makes sense). It kind of roars.
it’s also very responsive at low speeds. It wants to take off like a rocket as soon as it gets off the idle circuit and onto the mains and with the low gearing in first gear on my 5-speed, you have to really take it easy if you’re just idling around in a parking lot at the grocery store.
They ought to include these in the kit.