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OK If i were to get the following what can be expected in hp gains from stock? (and btw what is the sotck whp for our cars..?)

Impreza Unorthodox Pulley
Borla Impreza 'Cat. Back' Exhaust
NEW Borla Header Impreza 2.5/2.2 liter Dual port....

uhh?
 

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Stock WHP is somewhere between 96Hp - 120Hp. The reason the range is so broad is because of the different dyno's involved.

With the below mentioned mods you are looking at something near 8 - 15Hp. Remember, you can't find the total HP of all mods by just adding up all the HP claims from the parts manufacturers.



My power Mods:

1999 2.5RS

Stromung Cat-back exhaust with Stromung intermediate pipe
DIY 3" cold air mod to torque box
Borla Gen3 Headers
JCS lightened crank pulley
NGK V-Power plugs (copper)
JCS Auto Torque Chip II
205x50x16 tires
 
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