Hello fellow inmates! This is a quick review of the aftermarket Lexx exhaust MXe slip-on silencer with mid-pipe installed on a 2011 KTM 990 Adventure R. Product Information from ThumperJockey.com: SKU# tsk1201920026c $289.99 (You can also get these from RockyMountainATVMC.com, Amazon, eBay etc. but they charge more) · Dual Exhaust System. · Fully tunable exhaust system allows the user to change from a race exhaust (46mm Race Tip) to a forest friendly silencer (Quiet Core Insert) with just three bolts. · Engineered to improve torque and acceleration with an increase of up to 4 horsepower on some machines. · Lightweight design saves up to 3.5 lbs over the stock exhaust. · Included 46mm Race Tip for closed course competition. · Includes Forest Service approved Quiet Core Spark Arrestor Insert that brings sound levels down below 96db. · Constructed of lightweight 6061 T6 aluminum and durable 304 stainless steel. Customer service: The folks at ThumperJockey were professional and answered my questions succinctly. My cans shipped the day I placed the order and arrived two days later. Fit and Finish: The cans are well made with badging on both sides (the graphics dont do anything for me but you may like them). The mid pipes are simply flanged tubes with square bolts welded to the flange lip. The welds are not pretty but appear robust. A picture of the graphics :: A pic of the mid-pipe bolts :: Installation: The instructions are comprehensive and well written; Much better that I am used to for aftermarket parts. Installation was very straightforward. Remove the stock cans, bolt on the mid-pipes, slide on the cans, pull on the springs, and install the hangers. With the mid-pipes you dont use the metal gasket from the stock exhaust but you will need some high-temperature sealant for the flange interface and the mid-pipe to can connection. A 15-minute idle reset session and I was ready for a test ride! Evaluation: First, the sound with the spark arrestors installed - Yes, they are a bit louder than stock but not very much. Nowhere near as loud as the Leo Vince units. Closest sound comparison Ive heard is with the Wings cans. The tone is definitely deeper and a bit sharper (a bit more brap when you go hooligan) than the Wings but a very pleasant tone. These exhaust cans are glass packs and will probably get louder as the packing material ages and breaks down. I have about 400 miles on them and have not detected any change in the tone or loudness so far. Second, the heat management After the 15 minute idle reset I was able to put my hand directly on the can without getting burned. Man, what a difference! My passenger loves the reduced heat and is much more willing to go on 2-up rides with me big win. Also, the engine runs cooler according to the temperature gauge - a full bar cooler when running at constant pavement speed of 55. If I had put these on first I might not have bought the secondary radiator fan kit Third, change in performance I believe the bike now has more low to mid range power (say the 2 - 4.5K RPM region) than before but that is certainly a subjective measure. Since you can already pull farm implements with these machines, its not like they need the added power/torque anyway. The extra "perceived" power may simply be a secondary effect of the testosterone / endorphins generated by that cool, throaty sound Fourth, change in efficiency This really surprised me. I have a 100-mile road ride through the mountains that I use as my control setting. It is a beautiful ride through the Jemez Mountains in Northern New Mexico starting at 6500 feet, climbing to 9000 with lots of very cool scenic vistas and grin generating twistys. With my stock setup, I averaged 45.5 MPG on this ride. With the new cans, I averaged 49.5 MPG roughly a 10% increase. Summary: To reduce the heat, improve the sound, reduce the weight, maybe increase the power, and get me up to almost 50 MPG for under $300, this has been an awesome investment. Caveat I only have a couple hundred miles on these cans so remember this is an evaluation of the product as new. Ill provide an update after a couple thousand miles if anyone is interested. Thanks for listening!