i'm looking for a header for my 04 optra. I'm not interested in a turbo manifold just a header, anyone one know where i can find some so i can compare prices?
What kind of gain should you expect from a header in our cars ?
At least 10whp based off what only removing the same CAT that the headers do. I haven't been able to dyno the headers because my car hasn't been running right for over a year.
Danny, isn't the 10hp gain from the 4-2-1 header the same as putting in a test-pipe in place of the secondary CAT? I notice that a 10hp gain is stated on your ebay store for the test pipes you have for sale.
Regardless of choosing a header or pipe- don't you have to grind off the bolts to the CAT?
Danny, isn't the 10hp gain from the 4-2-1 header the same as putting in a test-pipe in place of the secondary CAT? I notice that a 10hp gain is stated on your ebay store for the test pipes you have for sale.
Regardless of choosing a header or pipe- don't you have to grind off the bolts to the CAT?
No headers should give better gains, and in much better areas of the power band for racing.
you might have to heat or grind of the bolts if there rusted in place, but the test pipe or the headers are a direct replacement. no custome fab needed
Won't removing the cat and adding a header throw a check engine light?
For some it has, for others it hasn't. If it does there are ways to fool it. Some memorys got ride of a CEL with $5 worth of parts while it didn't work for others.
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