Quote:
Originally Posted by Tcoat
This is what I mean when I always say the car was pretty much topped out when built. It already has a header. You are not going to get mega gains from swapping one header for another like you would pulling a traditional exhaust manifold and replacing with a header.
If swapping for an aftermarket catted header you are really doing nothing at all. The stock header with the cat knocked out of it is probably just as free flowing as the majority of the uncatted aftermarkets ones.
It is really all in the tune since even with the stock catted header the car is set up for mileage and emissions from the factory. Tuning to take more advantage of the stock set up has more of an effect than just swapping headers.
Now this dude will get some nice gains by swapping
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Bottom line is that me, like many other people I'm sure, probably drank the kool aid and fell for the many companies that claim gains if you drop loads of cash for their parts.