Throttle Body and headers

[IntenseBlue]

Does anyone know of a horsepower chart for throttle body sizes and when to upgrade? I was also wondering when to go from 1 5/8 headers to 1 3/4 headers. I think it's like 475hp or so.

Really interested on the throttle bodies though. Somebody email Accufab.

 

[notchback]

stock tb is good til about 300-325 maybe

1 3/4" headers ..alot 450-500 probably

 

[Paul Perreca]

changing the stock throttlebody will speed up the process of attaining that 300 horsepower faster, but it's not a necessity until that power

 

[IntenseBlue]

I was wondering when to go from a 65 to a 70, 70 to 75, etc.

 

[Topdowncruise]

Unless you are planning a supercharger the TB and header mods you are talking about wouldn't be necesssary in my opinion and would likely hurt your bottom end torque which makes your car less fun to drive around town..