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N/A is for those satisfied with not enough.. boost is the way to go with an I4. Boooost it.
Here's some additional stuff that will also greatly compliment boost when you decide to do it:
- 62mm throttle body
- 2.3L camshafts
- ported and polished head
Aleromod.com Upgrades: LD9 2.4L Twin Cam
Also, depending on your mileage/condition of engine, spray a wet Nitrous Express 50 shot.