hi hi kylim8
If u want to mod your s15 to 450hp then u only need to change all your eng head set to
HKS step 3,
Greddy T67,25g turbo and
Power Fc ecu.
Hope this list can give u some ideal
ok here is my story for all evo owners....i was at seremban highway from klg to seremban hehe...yesterday afternoon around....5pm something....half way..with my ride i saw one white perdana with biggest mufler...