for 170rwkws all ull need is a bit of boost, cat back exhaust, pod/panel filter and an safc. it will make this power safely with the stock smic
filter $200 max
cat back 2nd hand between $200-500
ebc between $100-500
safc 2nd hand - $200
if it was upto me id go in order
powerfc - $950 new
2nd hand cat back $200-500
dump/front pipe - $450
filter $50-200
ebc
for a bit more spend u get alot better power n better fuel economy due to the powerfc