will this combo kill my MPG?

You live in Philly,gets nasty cold. You need the heat riser port,and the Performer . Cam,a great choice.The lack of heat riser(under carb)heat,is what kills cold drivability,and m.p.g.'s. A Thermoquad ,in that weather,would rock. Rumblefish,lives in N.Y.He might know.