Mark I run the 3,77 Ring and Pinion and standard 5th. Its more than enough in my opinion. With 295/50-15 Tires its about 2100rpm at 100kmh/60mph. I think you will regret it if you do both unless you commute on the German Autobahn every day. My 5th is only really usefull when going fast i.e. Above 100kmh but then it is also a true pleasure. Just think about it twice is my advice.
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