In case you would like to use the 123/TUNE-4-R-V-V, the 123/VW-R or the 123/VW-R-V in your Porsche, this ring wil make the 123ignition fit.
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When an application of the 123/TUNE-4-R-V-V, the 123/VW-R or the 123/VW-R-V is made into your Porsche, this ring will make the 123ignition fit.
In case the length of the 123ignition is too long, this aluminum ring can be placed over the stamp. This will shorten the part of the 123ignition which fits in the engine, by 0.27in (7mm)