Purge system? I have no idea, like i said, the previous owner bought the JWT system and had it installed. I don't know if he was proficient enough to ask the right probing questions or just went with what was suggested. I can tell you what I see as part of the NOS system...the bottle, the solenoid, the lines, a switch and the lines coming from the ECU along with the JWT ECU. I looked at the ECU and recall it did have a sticker suggesting what jets to use....but what size are in the intake plenums I couldn't say, any way to know from looking?