I read an article about TR3s discussing how, even if the motor is running fine , the Su's can still be too rich at idle and too lean on acceleration. The upshot was that if an 02 sensor was installed it would provide info to dial in the exact type of SU needles that would really wake up the power. Anyone installed an 02 sensor..what type? any advice? I use my 3 for fun driving and maybe autocross. Have a mild cam and header. I realize that doing head work is the best way to increse power but I'm intigued by the notion of the right SU needles maximizing my existing mods. Karl