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GReddy SOHC turbo is rated at 5.5 psi on stock wastegate setting. At this boost level, you do not need an intercooler based on GReddy r&d. But it will NOT hurt to have one. Anything above 5.5 psi, get an intercooler. Intercoolers are designed to achieve a more efficient combustion. So yes it will help. You can get the intercooler kit later. I have seen the 19T GReddy 6gen SOHC kit. They have made some very drastic changes. The pipings are now aluminum vice steel like the 15G 5gen SOHC kit before. The Type31 intercooler has been redesigned. It is bigger with a more desirable piping route.
As far as the e-manage goes, this is another improvement. The blue box is now obsolete to these kits. The best part is, the GReddy e-manage is controllable by a Profec-E01 boost controller providing the hardware and additional cabling is purchased. THat is not a bad deal. GReddy has always impressed me all their Boost controllers. Now a boost controller and a data logger???? Bad ass!
Do not forget to get a BOV. The kit does not come with it.
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