My head canon...since the navigator has the same output, it wouldn't make since to offer the platty with mostly the same features at the same price point as it would eat into nav sales. The timberline and sport will follow be I. Their own niche. Also, the timberline gets the added horses due to added weight of skid plates, tires, and suspension parts. But rele though, can you feel those 40 horses. It's gonna take maybe .3 sec off the 60 time max.