i have had my car tuned by jeff the snow man and was wanting a retune i cant get a hold of him on tr or anything he disappeared well i was wondering since he tuned the stock ecu will it be bad if i buy an ecutek or the turbo xs utec or something and let another tuner tune it because since they are piggy backs dont they require a stock ecu or do they replace it becasue if they do then geting a retune isnt out of the question unles it is ???

please help