Dissapointing performance

bobscuda67 said

If you drive your car on the street at all you need a vacuum advance.
If your car is used from idle to full throttle only, as in race car, then a vacuum advance isn't needed.

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I agree. I once tried to look where to find vacuum canister than gives less advange than normal unit, but I have not found them. Do you know where to get them? It also needs to be adjustable on what vacuum level it works. Not all canister have this option. (screw inside of vacuum hose nipple)