If I were to do it again I'd save the money, or spend it on suspension parts. I replaced mine because I hit a raised manhole and crimped the factory downpipe pretty good. I would have to say I felt a ZERO gain in hp, the car did get slightly louder at VTEC but that's it.

When we did the DC on my friends car the OEM ports were actually larger then the DC as was the collector but the merges and welds weren't as smooth. I think DC could've made the header better but for some reason they just made it, but didn't make it better.