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Yeah its all been done years back, I am aware of the variable runner length designs and also the air box vent. I might have mentioned that Mini did it on the JCW kit on the cooper back in 2003-2006.
The bottom line is that on obd1 cars you could probably get away with the added vacuum chamber to the intake manifold and not get a CE light. You could put the torque right where you want it for the best mpg's.
I insulated the 2 tubes in an effort to see if the intake temps are better controlled and it looks like that might have helped. Temps are pretty decent for good mpg's but they spike too high when the truck is in slow traffic or city stop & go.
I can keep this thread posted if there is interest. I am restoring this truck currently and am working on the front & rear suspension so nothing to add for mpg's from it. I am running another 3 work trip tank to see if there is any change from the last tank.
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