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Weird Problem
So when the car shift from 3 to 4th at wide open throttle if the boost is around 17 or less every thing is perfect. If it 18 or more its like the exhaust valves close. It goes quite. power is still their but quite like the valves are closed.
Anyone ever had a problem like this? Its driving me nuts. straight pipe wonder, seems impossible, but could the exhaust shut the valves? Seems impossible?
Any input help much appreciated!
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