Hi guys, I am considering an A4 3.0 Tdi Quattro saloon 2011/12 model. unbelievable performance as standard, however, can anyone recommend a good 'plug in' performance box/chip. I had one before on my A4 2.0 143ps.....very unimpressed.....cost about £300.00 and did not work very well. only used it about twice!!!! Anyway, your help would be much appreciated. Thanks everyone