The install and green brackets of death were straight forward, and was done without removing the intake manifold. basically the finish of the injectors was a 9 out of a 10. the end caps we just smoothed out to ensure they would not cause any problems later down the road. there were tiny little unsmooth metal deposits on them. what i mean is that on the end cap it is polished nicely and there was a slight little piece where the metal was either smoothed or made where it was only 99% flat. the guy installing them is an engineer, so he likes to over do things. may not have been had to be done. the injectors indeed made the car run horrible, only at idle, keeping the AC on actually helped. still after being tuned my car at idle sounds like i have cams to an american car, but thats fine. even in - degree weather the car starts right up. and when the larger turbo comes on, it guzzles up the fuel. everything works properly. these injectors were designed for higher flow. I have seen the 740cc mod and done it, but i am still worried about them and decided to stay with an injector that is definately proven, maybe expensive, but definately proven.