I posted the following comment to a thread on the "other" forum and eventually started getting the usual crap from the rude A-holes that seem to be dominating that site now. It occurred to me (I know..Duh!) that I really should have posted my comments and current project here instead. So, here is the content of 2 of my postings to a thread there relative to Springfield Lower Deflectors. I hope you find it informative... I added the factory deflectors to my Springfield this Spring and believe they block too much air from the rider and engine. The increased heat directed to the rider while testing the OEM deflectors on mid-70's Tennessee Spring rides were just plain uncomfortable. Indian changed the mounts to address the change in rake for the Springfield, but used the same large plastic deflectors as those used for the Chiefs. The 4 degrees of difference between the two models (Springfield = 25 degrees vs Chiefs at 29 degrees) seems to have aggravated the problem when using the same size deflector panels for both models. The result of this difference is the Springfield deflectors "stand" more upright and tend to increase the air pressure on those large plastic deflector panels which reduces the movement of more air than on the Chiefs (I rode both and noticed this difference). Apparently, Indian might have agreed as they apparently originally designed a smaller panel for the Springfield (see the picture of the deflector on the Indian website), but did not provide that panel in the Springfield deflector kit. One side note, the mounts for the Springfield are steel, but might be marginal with respect to handling the air pressure created by the large panels (set at 25 degrees rake) when traveling at freeway speeds as I've found that they tend to "bend" a bit after a 50-60 mile higher speed (70-80 mph). As a result of my experience, I am currently working with Freedom Windshield's John Lauck to develop an improved deflector panel that will replace the OEM panel on my Springfield (using the stock mounting system). My goal is to reduce wind buffeting while still providing enough air movement to the rider and engine. Of course, others may find the OEM deflectors just fine...so, to each his/her own. If John and I come up with a solution, I'll post it on the forum. In an attempt to answer a question I received about any long term effect of using lowers, I had this response... These engines run pretty hot in the summer and I'm betting the Polaris engineers have taken this into account when testing the lower deflectors (at least they were involved in that). However, less heat is better for the engine's longevity (at least in my opinion) and maybe more importantly...for the rider. I feel the temperature difference is extreme when the deflectors are installed vs removed (at least the panels...leaving the mounting hardware in place). That is why I have been working with the owner at Freedom Shields to come up with a new design for the deflector panel. I am attaching an example of the 1st prototype that has since been changed to address the OEM interference with the wiring to the turn signals and by shortening the overall height by 1/2" to address the higher air pressure induced by Indian using the same panel as on the Vintage/Chief (remember the 4 degree less rake will "stand" the panel more vertical). I hope to test the 2nd prototype soon.