Customer in canada recently sent this to me. Thought it would be good info for you guys.
I am sending you dyno sheet of before and after. It is positive result and I am sure that you'll find this helpful.
94 GSR, JDM type R pistons, BC3+ cams, AEM 3" CAI, Stock Type R catback, first pass was with JDM 4into1 and tuned4 was somewhat tuned with your header, VTEC was not addressed at that point and had to be raised from 5600 to 5800 for smooth transition.
Again, I respect what you did for me and this dyno comes to you with no conditions attached, rest is up to you.
with almost NO TUNING and VTEC not even touched it was damn near 11whp over the JDM 2.5in/DC SPort header