I have installed RCexl on quite a few DA engines and never had a complaint, Customer love the way the engines run and the lower cost of replacing the ignitions.

No they are not a direct replacement, You have to drill and tap one new hole to time and mount the ignition sensor.

Also have installed them on ZDZ, 3W, Fuji and Zenoah engines.

Sometimes the RCexl is 1/4 the cost of a original manufacture replacement.

I have not bought one but heard that 3W is now getting $250.00 for a twin replacement

Milton