What are the differences between stage III and III+ IA chips?

[Audi Sport]

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What exactly is the difference between stage 3 and 3+ Intended Acceleration
chips? Is it only the 250kpa transducer? So if the computer's got the 250kpa
transducer that makes it the 3+? And exactly how much do they each cost? I was
trying to get this info from Ned Richie himself. I called him but I just keep
getting his voice mail and left him two messages. Still haven't heard from
him. So, if one of you could provide me with this info it would be very
helpful.
Thank you.
Dan

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