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The Twisted Development exhaust flanges are shaped differently than the stock OEM flange, which can change the engine character of the new KTM 450 SX-F. We went through several during testing and found out a size/shape that can actually enhance the low to mid range power character. Compared to the stock piece the TD Performance flange will give you better throttle response through area 2-3 (mid to exit) of corners. Another advantage to me is that the TD flange helps pulling power out of corners as well and helps third gear lugability. The TD flange just helps the RPM’s pick up quicker, which in turn makes the KTM feel lighter when the track gets bumpy. There is no need to remap your ECU and it takes minutes to install. This flange will work with any current aftermarket muffler or with the stock muffler on the new generation KTM 450 SX-F’s. I tried it on a stock muffler system as well as a full FMF system and with both, the TD flange helped in aforementioned areas. For $200.00 bucks, to me, it’s a great way to get a little more snap out of your KTM 450 SX-F.
Installing is as easy as unbolting the stock one and bolting up the TD flange. Cheaper than an exhaust, at $250.00 and its power that you can actually feel.
