I have seen a lot of info on chipping the A4 TDi 110 engine, which ones do you think are the best for your money, and which should I look for power or torque? I have a 1997 A4 1.9 Tdi Quattro and woulld like to boost it a little. Is changing the ECU a good or bad thing and should I wait until the year's warranty I got with the Audi Dealership runs out so it isn't made invalid by mod -ing the engine in any way