Quote:
Originally Posted by dd1981
No the M performance exhaust will come with a new flap and the actuator, so you do not have to reinstall it. It will come with everything your old exhaust had.
If you choose to leave the flap fully open, your best option is to remove the spring between the valve and the actuator and tie it off with wire or use a clamp.
From what I have heard if you simply unplug the valve it won't throw a check engine light, but it will throw a code that the dealer will see.
If you just take the spring out and tie the butterfly valve the actuator still works when plugged in, so there is no change to the behavior of the car. Not sure how why your dealer thinks this affects fuel. There may be something we don't know but all I know is my car is fine after 8,000 miles without that spring in it.
Honestly I believe that that valve is there for droning purposes as the drone and exhaust note does go up if you take the spring out, especially at very low rpms. Once you go full throttle even if that valve is closed without the mod it instantly goes open.
One thing to remember, anytime you put on a higher flowing exhaust on your car, you will always lose a bit on the low end, but gain a ton of power up top. Naturally because your car is flowing much much better.
I've been around performance cars a long time and an internal combustion engine is an internal combustion engine no matter make or model.
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Thank you for the explanation. The more i consider it the closer i am to the idea to leave the flap as it is and simply install the Performance exhaust. The effect from removing the flap does not seem to be worth going through all that mess with springs and wires.