the time it gave me 320, i did nothing but highway driving(trip). it would usually go for about from 295-300. so it did give me good gas mileage. i'm not saying that the tornado was the only thing affecting the gas mileage but i'm pretty sure it helped. and before i installed it, i had never taken a 2 1/2 hr trip, so i don't what it would've given me then
the time it gave me 320, i did nothing but highway driving(trip). it would usually go for about from 295-300. so it did give me good gas mileage. i'm not saying that the tornado was the only thing affecting the gas mileage but i'm pretty sure it helped. and before i installed it, i had never taken a 2 1/2 hr trip, so i don't what it would've given me then
To get you back on track here... I think you should be fine, but you don't have many mods. I have a BBK 65mm on mine, and wish I had a 70mm for when I FINALLY upgrade my headers. Soon I plan on an engine rebuild or a crate engine with aluminum heads. So if you get a 70mm and think it's overwhelming your engine, and you don't plan to mod it much more... maybe we can work out a trade?