hey guys I'm debating on what would be best on doing with my KE70
making it 4k-e, 4k-u, building the 4k-c or building a 7k.
i would just like it too still be cool old school and be able to somewhat keep up with my mates in there s13's etc
would anyone be able to help me out on reliable cheap but ways to pump some more power out keeping it legal and old school
cheers