I have APR installed my TT. I didn't think I was getting what I should as far as horse power. I was right, had car 225 TT inspected today where I had it installed. It seems the program is installed properly. Stock, 91 and 93. They report that I may need a new MAF, I say may they can't be sure. There is no noticeable difference between the three programs and it has been like that since it was installed. Before I install a new sensor have any you guys had this problem or can comment??? The report I have indicates boost levels normal for all programs. Intake system pressure tested, no leaks. MAF readings @ max 185 - 189g/s, therefofre MAF failure.

 

The only thing I've heard reading through other forums is that APR is a milder tune compared to some of the others. Even though, you should feel a signifigant increase in power with the re-programming, otherwise it would get totally dismissed on the forums. Lot's of people seem content with the product.
When chipping my previous Jetta, I found the difference was like night and day, it really woke the car up big time (I had Revo installed). At one point I had the MAF sensor go bad on my Jetta, and the result was reduced and inconsistent power delivery along with cel's (check engine light). Replacing the MAF sensor restored everything back to normal. You may want to replace the MAF sensor to verify, but if your still not happy, have them reflash it back to stock and get your money back. I'm sure they will reimburse if your not satisfied.

 

and thats why im not going to do it!

 

I have GIAC on my GTI, night and day difference, TT very minor change with APR. I don't think I will get my money back as it was installed over a year ago!

 

I had my 05 upgraded about a year ago now Stage II. Once it was upgraded found that I had a pin hole in pressure line running to the Turbo or divert valve, which made the car lose power. However, when we corrected it, it was like night & day.