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Premium Member
1999 OBS Steel Blue Mica
259 Posts
I have the fuel rails on my RS-T along with the TEC-II & 550's... You need the TEC-II to control the 550's that he sells since the impedence (sp??) is not equal to that of the ECU.

On a WRX, you can use the STi pink 565's with the Unichip as they are both the same impedence rating.

Make sense?

Otherwise, the combination is awesome. I really like the combination of the fuel rails, the TEC-II and all the rest of the toys... :)
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