Hello, I would definitely change them to 370cc. I'm going turbo in a month or two and I'm going with 370cc. Going to boost 7psi for everyday use and once in a while 10psi. And at 10psi, the 370cc are working hard. So yes you need to change them.
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I've been running my turbo with the stock injectors @ 5psi and it is fine. I got the ECU preprogramed for that from JWT. They said that the injectors will max out at 4.85Volts measured from the MAF. The 5psi is measured passed the IC and in high speed I get up to 6 psi. When I measured my MAF voltage it was at 4.76 Vols max.
<font face="Verdana, Arial" size="2">Originally posted by SC-MECHAM-WS6: Are they absolutely needed when boosting an SRDE20?