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I have experienced similiar "bogging" on acceleration with turbo cars and it turned out to be a bad turbo hose.
A leaking hose will many times not produce any problems until the turbo engages and supplies boost (pressure) which opens the flaw in the hose.
I check mine with the same brake reservoir cap I use to flush my brake system with a bicycle pump. Install it in the hose that exits the turbl and set the regulator on the compressor to about 15psi Attach the air chuck to the cap valve and any leaks will instantly reveal themselves with the telltale rush of leaking air.
Randy
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