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      10-22-2012, 09:37 AM   #16
m3an
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Drives: M3
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Quote:
Originally Posted by 1SICKM View Post
Finding out the injector size is difficult. Do you think ESS or these tuners want to release their secrets and hard earned R/D. Gains from stock exhaust to catless are approx 20-25 whp. Gains from 535 to 575 pulley only are minimal. I saw approx 15whp. You would get more from upgrading to the 575 kit because the car is then tuned for it and the injectors are different. IMO - if your upgrading from 535....just go to the 600 or 625.
It's not difficult at all and certainly not a secret. I believe they're Bosch 40lbs but may be wrong. A shop would be able to flow test them to calculate they're size though.