I just installed the Dr Pulley 14g sliders in my 2012 GTI300. It definitely runs stronger. Have only had them in for about 50 miles, but the scoot accelerates better. Don't know my top end, but she'll hit 80 on the speedometer no problem. Still plenty fast for me. For the money and time involved to install, I would say go for it! All I have is a small postal scale, but according to that, the stock rollers were 15g.