Drilling small hole on side of stock bypass valve

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S13240
Posts: 1908
Joined: Fri Jul 26, 2002 8:06 am

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I was looking through one of the instruction manuals that I received with my Tomei turbo kit and of course everything is in Japanese, but pictures show that they drilled a very small hole into a chamber on the side of the stock sr bypass valve? I am assuming that drilling that small hole is an upgrade to hold more boost for the bigger turbo? Anyone know anything about this?


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