These cars are pretty easy to mod and work on Read the modding safely thread listed above and ask questions on here

As long as you have a half decent set of tools to work with and willingness to learn its pretty easy just remember

Cheap-Reliable-fast You can only have 2 of these

And it all depends how far you want to go
Make your own intake set up ,a hv3 insert, computer tune , and a few other things or you can top swap but thats more indepth and more expensive