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I just recently bought a 05 srt4. Should i by a turbo timer for a stock srt4 or no?

nope

I just recently bought a 05 srt4. Should i by a turbo timer for a stock srt4 or no?

A turbo timer is mainly for a big turbo that does not have coolant line to cool the turbo.. If a Stock turbo needed a turbo timer the car would have it from the factory.. I would save your money for the rubber you will burn!! LOL. Congrats on the new car...