FOR KTM 450 SX-F $1,049.99

Dirt Rider - - Route Sheet - —Kris Keefer

It’s not easy th­ese days to get more horse­power with an af­ter­mar­ket ex­haust sys­tem. Sim­ply put, man­u­fac­tur­ers are build­ing stock ex­hausts bet­ter and bet­ter each year. FMF, how­ever, did a great job of ac­cen­tu­at­ing the highlights of our 2017 KTM 450 SX-F with its Fac­tory 4.1 Ti­ta­nium Full Sys­tem.

Get­ting the stock sys­tem off of the 450 SX-F is not the eas­i­est thing to do. You have to drop the link­age and re­move the shock to let the long stock head pipe wig­gle its way free. Once that is over, how­ever, in­stalling the FMF sys­tem is pain­less, and if you want to re­move the FMF sys­tem for any rea­son, you will not have to re­move the link­age and shock be­cause the three-piece 4.1 sys­tem comes off without has­sle.

Once on the track you im­me­di­ately no­tice bet­ter throt­tle re­sponse and im­proved bot­tom-end pulling power. Com­ing out of cor­ners and rolling on the throt­tle you can feel more meat (or pull) when in soft con­di­tions. Al­though with the FMF 4.1 sys­tem in­stalled it is a lit­tle louder than the stock muf­fler, in re­turn you are get­ting bet­ter pull and a live­lier en­gine char­ac­ter. It makes the light KTM 450 SX-F feel even lighter due to the crisp throt­tle re­sponse. Midrange is in­creased as I no­ticed third-gear roll-on was stronger down straights. With the stock ex­haust in Map 1 it was tough to run third gear in some tighter cor­ners, but with the FMF sys­tem the KTM was friend­lier in third gear and could pick up rpm quicker. Top-end and over-rev didn’t im­prove over stock, but the FMF sys­tem didn’t hurt it ei­ther. There is plenty of en­gine up on top, and the over-rev, a stand­out qual­ity of the or­ange steed, wasn’t com­pro­mised.

I have no­ticed when run­ning a 120 rear tire that the tire does touch the in­side of the muf­fler, but if run­ning a 110-size rear tire no marks were shown. Rid­ers might get even more rub­bing marks if run­ning this muf­fler with an 18inch rear tire for off-road con­di­tions. The com­plete FMF 4.1 ti­ta­nium sys­tem re­duces weight of the KTM by an­other 1.4 pounds (com­pared to the stock sys­tem)! I can get any­where be­tween 10 to 14 en­gine hours on the muf­fler be­fore I need to think about repack­ing. You will no­tice the 4.1’s muf­fler can sound a lit­tle rat­tly when that time comes. Do not try to keep rid­ing with the muf­fler pack­ing burned out, as you will only break the core off in­side the can and cause your­self more trou­ble.

I am very happy with the per­for­mance, looks, and qual­ity of the FMF 4.1 Ti­ta­nium Full Sys­tem and would rec­om­mend this sys­tem for any­one who wants to make their al­ready fast KTM 450 SX-F a lit­tle faster and even lighter. It’s a win-win.



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