right ive got a hillpower ik which was on the car when i got it its in a semi enclosed heat shield with cold air feed and it sounds ****ing amazing. however purely on performance would a good element like itg in the standard airbox be a better bet? ive popped the bonnet after a good run and the top of the filter is warm from the engine heat. in saying that it doesnt feel sluggish. should i wait until after winter then put the airbox back on and take advantage of the cold air?