Hondata

i received the reflash couple days ago and i'm pleased with the results..thank you hondata..anyway, i'm currently running hondata #4, injen CAI and evo2 catback..i know my car will run lean if i mix #4 and dc race header together...my question is if i get the megan test pipe and use it with my stock header, will i run lean? thanks

Yes, it will probably run leaner than optimal, and no, it will not damage anything. The only way to know is to dyno the car.