The Pug from what I tested yes is one of the fastest, if not fastest, at smaller tracks Cape south.. But it does suffer from slight straight line speed deficiency at tracks like Monza and Spa but it still amoung the faster cars. So maybe as I said to Furi could need a bit more weight, I'm pretty sure when I tested it, it didn't have all power mods on it too but can't remember which..
But that said most of the cars can break into 18s Mazda, VW, Honda and Pug I know can. I expected Ford to aswell given the spec I was shown. Infi and BMW sit around 19.0-19.2 for me but I'm sure they have more. Audi is similar, never really got to grips with it.