Hi, I wanted to see what the G550 would sound like with the valves always open and found that under the valve motor is a spring that comes right off - this spring connects the valve motor to the exhaust valve/flapper. I simply removed the spring, safety wired the valve open and put everything back. Didn't even disconnect the valve motor. Has anyone else tried this? I did one side and started the car - it was fine. Did the other side and now the CEL has popped up and I believe the car is in limp mode. No info on the dash aside from the CEL. Pulling the codes tomorrow.

 

Probably triggered the Catalytic converters low back pressure sensor. That valve is only supposed to open under higher exhaust pressure to maintain efficacy of the catalytic converter and engine efficiency.

 

I have the Renntech evm for 3 years now. I always keep the exhaust loud and never had a cel. I installed myself. Easy 30-40 min job.

 

I am pretty positive the CEL is due to the flapper motor is not having anything to rotate - it can't find the end stops. Since I don't ever plan on closing the flaps, I'm going to make these caps with end stops inside so I can leave the flaps safety wired open.

 

curious about the Renntech product?