Quote:
Originally Posted by Ultimatecarman45
That means that he dynod it first without the cat's on, then right away dynod it with the cat removed. Best way to get results since conditions that change like weather etc., that can effect results.
On my own note though, I think you might get a Check engine light if you don't install the cat simulators too.
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Exactly. My car was used for development of the headers. It was dyno'd in every possible configuration. With & without an air filter; with and without cats; with and without Magnaflow cat-back attached to the headers; 1 3/4" headers, 1 7/8" headers; and finally stepped headers (on my car now). I think we actually got 9 hp by deleting the cats.