totallimmortal

I didn't read every post but yes you can make 300 hp all motor but you won't wat to drive it on the street. the huge ports would cause much faster engine wear and very frequent rebuilds. i would think 300 hp would be tough without a PP. 260-260 may be street port numbers for a modded tii not a 13b NA. full bridge may get close to 300 but then you have a haigh unstable idle and like i said VERY frequent rebuilds for a street car. Also i would never trust our ancient ecu's with only a piggyback for that kind of power, you'd need a standalone for sure. I don't know what kinda money you have but i hope it's alot. with gas around 4 a gallon i doubts a 300 hp na motor would get much more than 10 mpg. Even if you can make 300 hp NA you could do it cheaper and easier with a turbo. you'd also get a better less peaky powerband, beter fuel economy, and more reliability. Why do you think mazda turbo'd em?