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hey everyone so i recently bought a sled its a 2015 skidoo xrs 800 with a d&d 862 big bore also has the dynojet tuner, so i ran it with the stock can hen i got it ran completely fine than i put a mbrp race can on it and instantly started back firing when i gave it a little gas from idle, the can is used not sure if that matters or not, can someone lead me the right direction on why this is? also it had bad fuel so i drained it and but good fuel in it. after all that i threw the stock can back n and it runs fine again its very annoying seeing the sled only has 1700 kms
 

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stock can it runs fine, aftermarket can it backfires. Technically, it is probably forward fire (through the exhaust). Stock muffler provides correct back pressure that it helps hold the unburned fuel in. MBRP can doesn't and fuel escapes to the can where it lights on fire. Usually more of a woof than a bark.
 
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