So i bought my DCRH brand new and it works great, gives good power. But...why is it so small compared to K20A2 and K20Z1 motors? the diameter of the pipes on the header is the same exact as the stock exhaust on my 06 SI. When I had my K20A2 in my 02 civic, the header was much bigger. Anyways, the real question as to why i'm posting this is...will the DCRH off the 05-06 rsx-s (K20A2) fit the 06 SI? Someone please answer this if you know, because i hate the fact that DC COULD'VE made it bigger for more power but didn't.