No matter what vehicle you have if the engine hasn't warmed up, acceleration is not the best. The reason for this is cause the engine has not reached maximum efficiency. Especially on cold winter days. When the engine is cold all the fluids are thick and hard to move especially the motor oil. Thats why your suppose to let it heat up. This is normal. Plus you shouldn't be driving the vehicle until it warms up to a good amount because it's harder on the engine and reduces life expectancy. When you push the engine hard when it's cold your forcing it to work harder, so ofcoarse it will sound loud. As the engine warms up it reaches the correct air/fuel mixture and things begin to go smoothly. The reason the noise is high is cause the RPM is up higher on a cold start. As it warms up the RPM goes down when the air to fuel ratio has settled and it starts to sound quiet again and accelerate as it should.

As for the tail light you have to give it a pull real hard towards you. It seems like it won't come out but it will. It takes some time but this is the way you have to do it. Make sure to loosen the 2 bolts before you do it too. Don't be too aggressive cause you can break the plastic rentention clips that help hold it in.