Here is some info taken from a web site. Its very useful and states that it will not course engine damage
The way in which it works differs from the factory rev limiter in that it is an ignition cut, as opposed to a fuel cut. The reason for this is because if an engine (particularly turbocharged) regularly hits a fuel-cut rev limit (such as in high performance driving, or particularly drifting) engine damage can arise due to the lean condition produced when the original ECU shuts off the fuel pump. The BEE*R rev-limiter allows fuel to pass into the engine still, limiting engine speed by disabling the ignition signal. The Bee*R rev limiter is fully adjustable in 500rpm increments, for safety reasons allowing only a lower rev-limit to be configured than standard. If you have spent a lot of money tuning your engine, or are running at high RPM’s for extended periods of time, it could be recommended to run a lower rev-limit to prolong engine life. Both Formula 1 and JGTC cars use ignition cutting rev limiters, so it is a fully race proven concept
And this info is about having a decat pipe n not a standard cat
Note: We would recommend the fitment of a Cat Replacement pipe when fitting this item if not already fitted to the vehicle otherwise the catalyser may become damaged over time when the device is active. A cat replacement pipe will also allow flames to become more visible from the exhaust when the device is active.
Hope this helps.
Tom