First, let me tell you I am no expert as I just bought my Cruiser last month. I dont think the K&N intake will hurt in the Winter but if you want to wait till spring to put it on and just take care of the restrictions in the stock system that should work and give you a benchmark to judge how well the new intake works. The only thing I have seen that works on the tranny shifts is the various chip mods that are for sale. I have never seen a shift kit but perhaps if you live close to a tranny speed shop you can ask them for a performance tune-up. These tiny 4 cylinders realy dont pull much they rely on making HP relatively high up on the rpm band. Hope this helps!
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