I'm installing a vetterman exhaust with two heat muffs and wondering what is the best way of routing the duct. The hole in the baffle is behind cylinder 3 so it seems to make sense to go into that muff 1st then over to the other side and then to the bypass vavle on the firewall. This would point the hot air right at the battery on the firewall when the heat wasn't being used in the cabin. Have others installed the bypass valve in this direction and did it cause issues?