Steve, I know that you have datalogged this more than anyone probably, so I have a few questions I hope you wouldn't mind answering. Aren't afr spikes normal during the shifts? Aren't afr's a function of the ECU, not the TCU? Is it possible that the ECU would iron out the spikes a bit after a little adaptive learning? Finally; Has anyone actually popped an engine, or fried a convertor because of this TCU mod(I haven't heard anything about that here)? Sorry for all the questions, but I'm just trying to understand it all since I just plugged in my newly tuned TCU from Eurocharged today. After initial trial run(took it a bit easy), I'm loving it! I'll need to do some datalogging before bringing it to the track I guess. I'm also guessing this was only a problem when pushed near to, or at RPM limiter through the gears, yes?