My brother's 98 EX-V6 Coupe had its check engine light go on and he noticed lots of pinging (it was very prounounced when accelerating slowly, i noticed it alot). Anyways, turns out it was this EGR, exhaust gas recirculator, and the part itself only cost like 16 bucks but with labor it came out to $200+

Anywayz, anyone know what the hell the EGR actually does? Thanks in advance, but I kinda doubt anyone WILL know.