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My B6 A4 Quattro has recently started to vibrate at speeds over 35mph. It can be felt through the seat base and a small bit through the steering wheel. The sensation is as i would expect if the tyres are flat spotted which causes mini vibrations that can be felt through the car. I initially...

Got my A4 2.5 TDI chipped by Upsolute. Runs fine but at about 1900rpm if i lift off gradually in gears 3-5 the engine makes a strange 'metallic' sound. Upsolute engineer cant say for definite but thinks it may be the diverter valve. in 6th at the same revs the engine stumbles/hesitates...

i run an a4 2.5v6 tdi. had 180bhp now has 210bhp plus masses of torque thanks to upsolute. Very reasonable price and exceptional home service. www.upsolute.com go on give it a go!