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Wanting the EX250 to sound better (better, as in "like other motorcycles, usually ones with more cylinders) is an old problem, and there is no solution.
I'm not saying you can't make the EX250 louder, you can make it really loud if you want to, but that's not going to change the basic "musical note" that a parallel two cylinder engine with a 180 degree crankshaft makes.
Truth is, above about 7,000 RPM the EX250 sounds great because at that frequency the human ear can no longer distinguish the actual sound of the piston's firing order. At high RPMs the EX250 sounds like any other "flat plane" crankshaft engine (and they all sound very good).
Below about 7,000 you're able to hear the actual firing order of the engine. The EX250's parallel twin flat plane crankshaft engine fires its cylinders only 180 degrees apart then there's nothing for the next 540 degrees of crankshaft rotation. That close firing followed by a long gap is what sounds bad to the ear. It sounds kind of "farty",
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