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Too many variables, could be less than 5 hp or more than 50.
if you can find the hp. of the eng., you can add between 12-20 more hp. for the headers.
It does depend on the engine, but I'd shoot a little higher and say headers will give a good 15-30 hp 3 or 4 hp depending on the engine
Headers will give u few nice HPs, as well as go to for an electric fan instead of the clutch operated one.
Changing carbs probably wouldn't add much if anything, but headers and dual exhaust could give 10 hp.
250+ hp
161 Hp
There are too many variables that determine what hp increase headers will give. Engine size, carbed,f.i.,stock,hi perforforman ce,car weight,the list goes on and on....
if you have EFI engine, replace your stock intake, headers, exhaust. installing racing filters improves air intake which can add power to your engine. replacing your stock headers and exhaust pipes with custom headers and mufflers can eliminate back pressure. doing this upgrade can give you additional 10 - 20 HP.
161 HP
The 2012 Scion xB's engine produces 158 hp @ 6000 rpm.
The 2009 Scion xB's engine produces 158 hp @ 6000 rpm.