Not ignoring you, just thought someone local would advise you. I have a couple of vendors I like for parts. One is Needswings, who has several add-ons to make you faster. Once you have the parts, a tune is in order. I use Eurocharged for that. There are other modifications you can do, and there are several threads discussing that on here as well. As far as the XF verses the TT or the Nissan, well, we all love our little cars on here. So, I wouldn't be interested in either. I have the supercharged version, and none of those cars will perform with mine. Either of mine... Hopefully, some of the car owners nearer to you will post up. Any further specific questions you have?