Generally turbos are the only cars that respond well to induction kits. I tried one on my A3 1.8T and it caused a bit of a flat spot just after 2000 rpm with a panel filter this was not the case. I'm more concerned about my MPG than my 0-60 these days so the top end boost does not have much exitement for me. The best value mod by far for your car is a remap it will take you to 200bhp or 300 if you swap the turbo!! Loads of torque not bad fuel consumption and all for around £250!
Some audi forums are a bit snobbish - unless you have a TT or car with less than 4 miles on the clock they are not interested.