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Originally Posted by Goat Blower
A turbo is a restriction to the engine itself, but since the turbo makes positive pressure, it's technically not a restriction. The less restriction after the turbo is best.
You're clearly asking this question in the wrong place, there's only about 5 DSM'rs in the country that'd have a solid answer for this. You're asking the 16G crowd here, thereby wasting yours and our time.
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I think you're wrong on both ends here. From what I can see, there are about a half of a dozen (at least) running GT35+ series or SCM61 in this forum.
I wouldn't know why a turbo wouldn't be a restriction.
1. Generally the pressure in the exhaust side is about double of what is in the compressed side.
2. The combustion chamber divides the intake and exhaust tracts. More pressure is caused by the explosion (expansion).
3. The turbines are spinning, but they're creating some backpressure. Which is why after the turbo, the best exhaust system is no exhaust system.