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Since I have only worked with the TEC3r, I can only tell you what I like and don't like about it. I can not compare it to other makes.
Likes:
> installation was easy - good instructions
> nice neat package (ECU, coils, harness, etc)
> good user interface - windows based, on the fly programming, tuning wizard, datalog capable
> price
Dis-likes:
> on-screen help for tuning is horrible - poorly written/explained
> tech support is OK, but they must not communicate internally since there is frustration about their product internally
> sensor problems - i've been thru 2 crank sensors - my cam sensor is a Hall Effect, but i have to set it as magnetic in the software....
> the ECU locked up the first week I had it - had to send it back
> the AMP connectors on the ECU did not mate properly, causing the car to die 30 min into a drive
The best piece of advice I could give you or anyone, is to find a good Porsche mechanic who is very familiar with a particular brand of EFI, and go with their recommendation. This way you have someone close by you can rely on to give guidance and advice. I completely recommend installing it yourself and tuning it yourself, as you learn a lot about your car and its performance. However, experience from the mechanic is invaluable and will save big money and lots of time- make sure you pay him/her for their time/experience.
In hindsight, I would probably go with an Autronic or Motec because so many more Porsche people use these units and assistance is easier to get.
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