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i would recommend you speak to the following companies -:
try ktec , yozzasport , gdi , angelworks .
they will give you some idea on power packages on offer
your not alone on this one , they do splutter from cold and pushing them doesn't make them warm up quicker (does more damage than good) time is your only weapon .
dependant on the model less stuff on the cups , look for a decent warranty incase of problems .
cambelt change , engine mounts (go quite alot) , strut top knocking .