on a stock engine its not going to do much of anything. you need to go after the part of your engine that is the most restrictive. either the intake or exhaust on stock engines

 

so if i have an intake it will help then or you need like full boltons?

 

at lest full boltons first, and then a nice sized cam. THEN start thinking about a TB

 

Like I previously stated, a 58mm TB isn't going to get you anything unless you're running around 350+ RWHP. A 52mm TB is probably a good thought if you're running a more mild setup that's getting you around 310-325 RWHP.