One of my buddies has a 99 SI with low miles and is pretty much a cream puff in perfect shape...it was owned by an older doctor who just drove it to work and babied it, my friend bought it and installed an AEM cold air and a short throw shifter. hes looking to sell soon, would it be a better idea to sell my 97 ex with intake, header and exhaust and buy his car or boost mine with a jackson racing supercharger ?