plugs couldnt hurt.

but your pretty much maxed out on the stock snail. the only other thing thats worth adding is a meth kit.

after your battery was reseted did you reload your real time map?
that happened to me last week. i accidently disconnected the battery and i forgot i needed to reload my realtime map and the car was running like crap w/issues. but i since then reloaded the map and she's working like she's suppose to.

also the AP with custom maps go for around 450.