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To my knowledge the only difference between the 2.5 and the 2.7/3.2 pipes is that the 2.5 test pipes have bungs for O2 sensors on them whereas the test pipes for 2.7s/3.2s do not?
This is because on 2.7s and 3.2s only the cats on the headers are monitored, so no need for any bungs on the midpipes.
Someone correct me if I am wrong.
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