Big One Xpanny - ****e ! Actually can slow bike down, top end lopped of power curve ... !
Arrow ... Look sweet !! Been considering myself, but don't know of any reports by lads here, so can't comment on power ??
DEP ... Superb & Prob best for your bike !!
However ...
If you gut your standard pipe .. [remove CAT Converter ..] & fit tail pipe of your choice ... [Doesn't matter which ! Even big ones sound sweet !] you will get the same sort of top end & very strong bottom end !
But ...
If it were mine, i would go DEP for the Gucci Factor, as the bikes a minter !
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Blue - DT 125 RE - '04 - First Of The Leccy Start Lanza'Like Bikes !
Iv got a DEP nice pipes, probly one of the dearer ones though but does make a nice difference in performance and sound, just make sure you clean it regularly or itl rust .