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Tubular manifold
Hi my forged hatch sti is running 417bhp 420ft/lb torque will changing to tubular maifold give much more torque mods so far owen development hta71 turbo (450bhp) aem innerwing kit bosch 650 injectors full 3” decatted exhaust system harvey up pipe 340lph fuel pump still on tmic |
something like an RCM / GT2 spec manifold (with matched Harvey Smith 'trick' up-pipe) will be far less restrictive than your current set-up at that level generally - we tend to find around 400 is the natural change point from ported headers / trick up-pipe
you will potentially loose a little spool swapping over so depends on how / where the car is used as to what you focus on |
I have your up pipe but not ported headers i only use the car on the road no track days |
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