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I just installed a ceramic HP Motorsports header. (Exact replica of the DC sports bolt-on 2001 Civic Header).
However, I overtourqed the two bolts that connect the flanges of the header and the downpipe. Now one of the bolts has broken off, and the other bolt is bent. I ordered two new ones from a Honda dealership, but they asked me to find out if the header thread pattern is the same for the stock bolts or do I need new ones. Does anyone know if the thread pattern to the Hp motorsports (or DC Sports) header is the same as the stock header?

 
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They should be the same bolts....I didn't have any trouble with mine, so I would suggest, just getting the new bolts from
Honda and get the torque specs and try it again. You're gonna dig that header...I have the DC 4-1 Ceramics and they ROCK !!
Good Luck man !!

Antidote's Civic

 
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If you were able to put them on, then they are the same pattern.

 
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Hey is the HP Header smog legal?

 
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Man, I recomend you take your car's head to a shop to get it checked and make shure you get everything right(threads) Or just drive it there.[IMG]i/expressions/face-icon-small-wink.gif[/IMG]

 
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If I had to guess the thread pattern would be .....M?(bolt size metric) X 1.25(thread pattern)......Peace!

 
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I am pretty sure that the headers have a CARB exemption.