I see a lot of people with 720cc secondaries. At about what HP would you recommend switching to 720cc? And then when would you go for like all four 720cc?

 

well if you are stock turbo stay with the 550's or go 720cc secondaries with the rtek (pocketlogger) 1.7. I have a bnr stage III and tried 720cc primaries but it just gave me hell with hot start issues and flooding so I whent back to 550 primaries. The new rtek 2.0 will allow you to run 550/550, 550/720 or 720/720.

 

With the right pressure and control, the stock injectors are good for ~300fwhp. 720cc/min secondaries will increase that to ~340fwhp and four 720's ~380fwhp.