i stole my spoiler form a hotwheels car, not sure which series, just have a look around and c which spoiler you like best. for a bodykit you can use either putty or plasticard. go to maki’s topic “my Wrx with full bodykit” for instructions on how to make a kit out of Plasticard. for putty jus apply it then sand it. and mould
to make an exhaust or muffler just use piping you get from a hobby store, if you have to make a few body mods just use an exacto knife to slice away excess plastic.
hope i have been some help, if you need any more pointers i would be happy to help