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Does the cat bypass system require a tune to avoid error codes?
Thanks
I tried extended sensors in an attempt to avoid the check engine light, but I still got a code. Check engine light is normal with bypass pipes. Sam from By Design ran a custom tune for me and removed it.
Below is a video we shot at our exhaust testing facility, highlighting our newer 991 Turbo "valved" GT2 RS style exhaust. This particular version has a 3.0 X-Pipe at the core and utilizes 100 cell HJS catalysts. It can be alternatively optioned with a 2.5 X-Pipe. A simple push of a button opens the cat dump pipes for a much more aggressive tone, same as the OEM exhaust on the 991.2 GT2 RS. With the valves closed, it's our traditional 3.0 X-Pipe. Additionally, the valves can be programmed to open up at any user defined RPM. We have found 5,500 RPM to be a great spot to transition to open valves.
Users should enjoy this system's options. It's great to be able to toggle back and forth with the sound or set a driver defined RPM for the valves to open.
As an example, the system allows the operator to be in the open or loud mode on the open road and when approaching a busy area, gas station, etc. with a lot of people, simply select the closed valve mode and the system instantly becomes much quieter, very civilized and refined, unless you want to remain loud such as arriving to a car meet or car show where everything is typically louder.
Here are a few pictures from the development stage and a video to demonstrate the system.
Valve closed
Installed
Valved pipe directly off the catalyst, same as 991 GT2 RS (the inner tip is for gasses travelling through the X-Pipe when dump valve is closed, the outer pipe/tip dumps straight out from the catalysts when open)
3.0 X-Pipe w/ rolled edge tips (slash cut also available and pictured above)