So I have an early model Acura NSX, seems that I cannot pull any performance cars above a lvl12 part. I've done repeated races (old and new), several bait crates and every single time I get new cards offered, they are all #12's.
I think it only goes up to 12. But here's a money tip: Get a drift car and keep doing the 'Drifting The Block' race. It is very easy, and it usually takes less than 2 minutes. You can get over $100,000 in less than 20 minutes
So there are speed cards that are above lvl 12. I have ran into this problem with the F150 Raptor. It seems it is locked at a 299 cap. And no matter how many races I complete or rolls on the trade in, it will only give lvl 12 cards. I have not seen anything online on which cars have which limits. But it does seem that the raptor is locked to go no higher than 299. Even with cards that have three perks.