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Is it true if I install afe race pipes without cats with my mid muffler delete I will lose horsepower and even boost or are some threads out of they’re mind
Would love to know and am going to go with stock tune with some Fowler’s
 

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Using the boost value alone to determine power is useless. Less boost could be due to the fact that the computer is hitting the desired load values and is commanding less boost. Or in the case of this car, the engine is running more efficient as a pump so you are seeing less positive pressure.

You can't base how much power you are making off of a single value like boost.

I'd be more concerned if you installed all of those exhaust side parts and you were getting a higher boost value..
 
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