I had a Dyno jet kit put in my SV on tuesday, and it is great. The power is so much smoother and the low end is a lot better (not that it was bad to start with). I just miss the surge of power at 5000rpm, because between 3-5000, the power is almost as high as 5000 up.
Also had the fork oil changed to 20wt with one extra shim, and the bike is much better balanced front and rear. And the forks were moved up the triple tree by a few mm and the steering is much more crisp. Kept the stock springs, they are working fine for me and my riding (i weigh 140)
All the work was done by bomax, and i'd have to say he doesn't BS you around like the dealer on commercial dr where i bought the bike. I'm sure the dealer would have wanted me to buy new springs, and whatever else, when i change fork oil is all that i needed.
Kudos to bomax