Chevrolet Corvette Stingray C7 Forum - View Single Post

donzi · 05-01-2014, 06:06 PM

Can anyone tell me how the upstream exhaust valve opens & closes or does it work with the rear valve. I have the rear valve open all the time but i can hear the up stream valve opening and closing. I have an A6 Z51 npp exhaust. When the valve is opening and closing sounds like the car is choking.

05-01-2014, 06:06 PM	#1
donzi Drives: C7 Z51 Cyber Gray Metallic, 05 GTO Join Date: Jan 2014 Location: New Jersey Posts: 14	Upstream exhaust valve Can anyone tell me how the upstream exhaust valve opens & closes or does it work with the rear valve. I have the rear valve open all the time but i can hear the up stream valve opening and closing. I have an A6 Z51 npp exhaust. When the valve is opening and closing sounds like the car is choking.