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anyone know if these are what they say they are??

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Range Rover Blues:
ECUs are well complicated peices of kit and I wouldn't recomend b****ing abvout with one in this manner.  Firsly it may not be legal.  Secondly if it creates a false air temp reading then the Lambda sensor will just correct any change, although you may get a fault code at your next dealer service.  Additionally  it will only fool EFi that uses volumetric ari flow sensore, like the flapper Range Rover EFI, a mass air flow system will not be as easily fooled by a spurious air temp sensor output.
Snake oil, I call it dung.  I could understand if it modified the sensor reading in line with the actual air temp but to fix it at one setting?  Car may not start some days!

TimM:
The earlier replies are spot on, you are getting a resistor worth a few pense and details of where to 'ram it in', I was considering buying one of these (or one similar) for my Audi, but I knew there must be something wrong so I contacted a previous buyer, who gave me the number off the resistor and told me where to put it, but although he did think he had more power - he felt the engine was running a little 'rougher', so even with the few pence upgrade available, I didn't bother and I don't personally thing you shoulld either.

Tim  :?

iianorthants:
we used to do a similar thing to Astra GTE’s and such, whack a resister in to make the car over fuel. But std car ran rough, needed to add decent exhaust and a top quality air filter to start noticing any difference (on the astra with a good sports exhaust and air filter plus resistor you would prob see a 20 BHP gain which made a big difference due to weight) and as you can guess used a lot more fuel.

 Better off getting a professional chip upgrade, so only over fuels when you stomp your foot down, which means you can get a better fuel economy, as they can set it to run more economically around towns and with normal driving.

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