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      11-03-2012, 12:17 PM   #22
lfelunden
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Drives: BMW M5 F10
Join Date: Aug 2011
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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.
+1 on this!