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
As i heard
Aftermarket BOV have problems with the Mitsu's
After running on boost and pressing the clutch to neutral
the engine rpm will slowly drop bt drop down and die..
you also will be running rich (accodring to...