buy what your heart is telling you. i look at things logically. to me, when i bought a pipe i looked at both brands. i've had muzzy pipes on ninjas through the years, and still concede that nothing makes a ninja sound better than a muzzy system. but reading through page after page on here led me to one conclusion- there's something else out there other than muzzy. it's called a biggun EvoX system. after finding out that the muzzy really isn't made for the 250 as you lose your rear footpeg because of the bend, hearing stories of spring mounts missing on brand new pipes coming from Muzzy, and not to mention that these pipes are harder to spot than Jesus Christ himself, I bought the biggun. Let me tell you that this thing was like nitrous for my bike. i couldn't believe the power gains with just the pipe alone. it is unbelieveable. the biggun uses a clamp instead of a pita spring to attach the midpipe to the collector. springs suck and are sometimes hard to stretch and then you're at the mercy of the weld of the spring mount. with a clamp you just tighten it or loosen it with a wrench. it looks much nicer imo as well. i think the biggun is cooler looking than the muzzy which i think is just too bland in it's satin with a black branded name all across the collector. the biggun just has a nice smal riveted plate at the end of the collector, also the red end cap is pretty trick also as it adds some color to the thing and lets people know your pipe is special. these are just my opinions and observations and are very subjective. you decide for yourself. i'm sure the muzzy is just as good as the biggun, but fitment and build quality issues are things i didn't want to subject my bike to.