open cutout vs full exhaust question

Reaper6

Member
Joined
Mar 30, 2008
my car seems to misfire and run richer with the cutout open. But if i close it it runs fine and seems to have no problems at all.
 
O2 readings were all over the place, it happens when im just cruising the car. More around 1200-1700 rpms.
 
Top