Hi, i have a problem with acceleration on my sxt+, but i dont understand why very slowly? I have 22 rims oem replica and low springs.Also i am rebuilded my engine 3.6, install new parts: candles ,oil etc. My acceleration 0-60mph ~ 9 sec. Its very slow. May be that big rims , may be something else. Stock acceleration - 6.8 sec. how is know?