The spring is how much boost you can run with that wastegate without a boost controller. All the tubular manifolds for a 7m use HKS standard 4-bolt flanges although because of the expense of this wastegate brand new many people just cut it off and weld another flange for another wastegate on.
Yup the earlier ones are hard to read. Go get yourself a new one for a '92 from Toyota, they read an extra 1/2 quart to full. So it will take another 1/2 quart to hit the full mark even though your oil should always be at full or above.
Sweet!!! I found brand new Tial 38mm wastegates at www.maperformance.com with your choice of color and spring.
It doesnt look very possible to change an oil filter with that set up with out taking the wastegate off.
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