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2.5r?

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2.5, 2.5r...same thing. People have claimed they were different but I have had both engines apart at the same time and I couldn't see any difference except the head on the 2.5r. I have had both running at the same time and still couldn't see a difference. IMO the 2.5r was a marketing scheme by traxxas and nothing more.
 
I was referring to the engines, the 2.5 compared to the 2.5r.
 
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