i have a 2012 ninja 650. unfortunately i laid it down and dented and scratched the muffler. i hate seeing it like that so i want to fix it. my 3 options are: buy a stock( aprox. $100), buy a slip on(aprox +/- $200), or buy an aftermarket full exhaust(aprox +/- $500). what are your thoughts? i dont mind the stock but i wouldnt mind it being louder and/or giving me more power. thanks!