ORIGINAL: JB COMP
what do you do if the engine only has one shim? can it still go from 30% to 20%?
Now that Sidewinder has had two price increase in the last 6 months I may switch back to 20% if it really will have the same power as 30% and be easier on plugs. (since plugs are getting $$$ now too)
Personally, I would remove it and use the lowest possible amount of nitro I could. Tune for crisp and clean and no sagging in a WOT pass and you will be fine.