I use a PC with similar specs. My advice would be to mix 2k and 4k skins: If there's a skin you know you will definitely use for racing or that's very stylish/iconic (f.e. the pink 911 RSR which won this year's Le Mans) use the 4k variant. If the skin is only used to get more realistic looking AI opponents use the 2k variant. I use this method for all car classes where this a lot of mod skins (especially GT3) and never run into performance problems.I'm not sure which skins to use for Mods. I'm running a laptop with Intel Core i7-6700 HQ CPU @ 2.60 GHz and 16gig of RAM. The graphics card is a GeForce GTX 960m. So, with these specs should I use 2k or 4k skins with downloaded mods. Thanks in advance.