I can't believe nobody has posted the OBVIOUS solution. Buy the streetflight turbo kit but forgo the intercooler. Turbos can make very large amounts of heat and it would of course be very cost effective to put a $5k turbo kit on a wrecked contour (wrecked from a drunken night going in reverse down a country road, that's what we do in the south). You can find the streetflight website at
www.streetflight.com/wreckedcontourswithturbosaregreathottubheaters