Originally Posted by chadow427
Originally Posted by Bugsi
Ultimately they should flow about the same as headers.
Not true! If they flowed the same, who'd spend the extra money for headers?
Let'* be reasonable here. People spending money on something is no indicator of whether it gives a significant (or any) performance increase. Just look at any Honda Civic with a big fat wing on the back. If we use your logic, those wings must add significant horsepower, because otherwise, people would not spend money on them.
I don't know (or care) why people spend their money on things that don't make any real performance differences on their cars. Maybe they just like spending money. But the performance of PEMs has been pretty well covered in several threads. I believe people have even done dyno tests before and after headers, and before and after PEMs. If I recall correctly, headers gave a small improvement, and so did PEMs.
People also spend money porting their exhaust manifolds, and it'* been fairly well covered that Bonneville exhaust manifolds breathe pretty well, especially if they're ported. Headers might be marginally better. But Bonneville exhaust manifolds perform very well as well.
So I stand by my advice that PEMs ultimately perform similarly to headers. Headers may perform slightly better. The differences are probably small. Even small differences are important to some people, so headers may be worth the extra cost to them.
But price has never been directly correlated to performance, and price alone is no reason to judge one product better than another.
As I suggested originally, people here who have them would be better equipped to give their experiences with them (both headers and PEMs.)
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