FWIW, speed density tuning is not for racing only. GM used to speed density tune the Corvettes and Camaros. My 93 Corvette LT1 engine was speed density tuned from the factory, no MAF sensor in the airstream, and ran like a bat out of hell. The engine is still running strong in my buddy's truck out in Greenville with the same exact tune I ran in it starting back in 1995 and it hasn't had to be retuned since.