i have a hot air car that is completely stock with 170,00 miles. runs very strong. i was looking into intercoolers to reduce temps, and to get alittle gain in horsepower. i was told that an alcohol injection system would be better. i dont know anything about these systems. are they really better? more expensive? would i have to do any other modifcations? what are the best companies? how exactly does it work? thanks for the help.