im gonna disagree there, the internals come apart at 400+hp on F/I engines because of added pressure from the added air/fuel. but a n/a engine with that same hp is because of the engines efficiancy to utilize the same fuel pressure as stock and un restricted air flow now, with the tf heads they use a smaller combustion chamber also, and larger intake valves for a less restrictive flow path. there is to a point added cylinder pressure but non as if there is from f/i. the heads bum compression to ~10.5:1-11:1 depending on grade of fuel used and higher with race fuel. with a s/c@9psi you compression jumps from a stock 9.5:1 to almost 12.5-13:1 ratio, thats why rods bend and break on stock bottom ends not from hp ratings at a given rpm. now i realize that there is a limit to these engines as far as rpm goes also. in conclusion when using FI you need more fuel for the added incoming air, but with n/a your utilizing and making the engine more efficiant to produce more hp. if it were me and my money id go n/a its safer, and i dont need more than 375hp on the street or a dd