Quote:
Originally Posted by Speedy Squirrel
Don't forget to check the backpressure (pressure between turbo outlet and cat), if you still have a catalyst on your car. My car has a fitting for this purpose (don't know if all years and models do). With enough misfire and/or rich operation the catalyst material (substrate) can break up and cause alot of backpressure. No enthalpy across the turbine = no boost!
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Had the exact same thought.
Worth looking into if you have a cat.