First off, I'm not going to do it, so I'll make that clear up front. Last thing I want to do is to reduce gas mileage and reliability for my 14 year-old car with phenomenal performance already.

But ECU Tuning Group advertises here and I finally clicked to see what was up. They offer an ECU upgrade (I'm sure just firmware or whatever it's termed for automotive electronics) for $1,995. They don't explain what, exactly you're purchasing.

http://www.ecutuninggroup.com/about/

Seems very generic, they don't differentiate between car models and make a claim that you "will feel it right away", but that it keeps getting better over a learning time of 100 miles, which seems sort of...not realistic?

Anyway, curious if anyone has done the upgrade, as it were. They very clearly state that they don't do it real-time on a dyno, you can even upload it yourself at home.

 

I have used a ECU box myself and I have to say its great, on eco mode added at least 80miles to a tank of fuel.
I can upgrade it to a sports mode and a super sports mode, its literally plug and play.

One beauty is you can change it on your phone
In super sport mode, its a hell of a lot quicker.

 

I sent both ecu's to Jags @ ECU tuning group and also my friends gt . He talked me thru how to remove my flying spur and friends gt. The end result is amazing !!!!! I paid $1995 because my car is a 06 with 2 files, his car has 4 files (08) therefore $2500. Gas mileage is improved on both cars. Hp is 681 on 91 pump gas. we run 93. it will bring all the power on from right away no lag .... car will get better after long trip.. highly recommend this tune. Jags is the owner and has been tuning bentley's for awhile. he currently tunes them for the bentley dealership new cars and preowned in California .btw both of our tunes are flawless after 2 years. he daily drive a RR wraith with 750hp ... he also owned several bentley gt that his tunes were run on...w12 and v8. i have never personally met him but i can call him at will... . if you tune your car without ecu removal you can only get about 610 hp.