Mine actually ran better, from what i can understand they are infinately adjustable, however the correct setting in critical. Mine starts extremely quick. Having just had mine done it appears that my fuel economy has suffered a little probably due to the slightly increased performance. I will have a better idea once i have run it for a while to get an average. So far i have only put 1 tank of fuel in it, and my driving hasn't changed, i suppose time will tell. Hope this helps
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