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Hi ive been reading up on this forum but this is my first post ,i own a AU xr8 series 1 with have the orange injectors ,altho there notthat bad on fuel i have heard that they put a softer tune in the cars equipt with 19 lb inj (orange color) an wondered if this is true an maybe worth changing to the 24lb (blue type) injectors get retuned with these ..Q2 is the donut lookin thing on the intake pipe serve a purpose or does it just hold a bit of air making it easier for the engines responsivness??
What cars have the 3.73 ratio an a direct swap into an AU ,i think mine has a 3.23 ratio atm ..i heard we can use Nissan R31 diff centres as they have better ratios,can anyone confirm?
Thanks
 
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