500whp isn’t as simple as just getting a Tune for e50, if your going to do it do it right. Get a 3 in catback- awe or thermal, a set of downpipes- they will help with top end power, get a cold air intake- S&b, fenfab etc, get a catch can- jlt, upr etc, get an intercooler- Cvt, whipple etc, get an ethanol sensor and an ethanol oil gauge or the sensor that works with blue tooth so you can monitor the ethanol content on your phone. Basically fbo plus and ethanol sensor, then get a tune- I’d recommend going with Goosetuned and getting an accessport. The above parts and tune will put you at around 525-530 awhp and maybe 550-560 tq. However, if you go chasing number be prepared to drop 7-8k on a built trans someday. These transmissions are weak from factory and aren’t rated for much more tq then they already come with.
I would also recommend getting a PPE transmission pan, the pan says it’s for the 10r80 don’t worry it fits, it’s cast aluminum instead of plastic and holds more fluid. It will help keep your trans temps lower when you’re driving hard or towing.