I don't like alienating other people on the lanes either, my crd can with the baffle in makes it sound a little bit more thumpery but without being too obtrusive. I've never rode mine with the standard zaust so I cant really say but most people say it makes the bike rev up more and get going a bit better by putting a aftermarket can on.
My TTR came with the standard exhaust and a FMF power core 4. The Power core 4 was way to loud and I tried various ways to make it quieter but failed so I sold it on.
Then I modded the standard exhaust ttr250.activeboard.com/t60104713/standard-exhaust-mod/ , I was quite happy with it until this exhaust came on eBay and I thought I'd give it a try. ttr250.activeboard.com/t60286245/exhaust-againwhite-brothers-e-series/
With this exhaust, modded airbox and a rejet it's made quite a difference, it revs faster and feels much more responsive and above all it just seems to run nicer all round.
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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..