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What spark plug life have people been experiencing on the Turbo models with ECU upgrade?<p>I had been finding that these cars love fresh plugs and 5K (or 1 year for me) is about the time it seems to be needed. In my case I start detecting some transient response issues - i.e. Upon brisk acceleration followed by lifting the throttle, followed by an immediate return to brisk acceleration, there is a hesitation. That hesitation last about 1 second (perhaps a little more).<p>I tried the Denso Iridiums last year, but these do not seem to last any longer. So far the OEM, copper, and Denso Iridiums seem to have the same life.<p>
 
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