It depends on how much money you want to spend. Will it make a difference, yes absolutely. The thing is will you notice, not necessarily, depends how far you've progressed on offroad. Like the above poster mentioned even if you use big bore springs it will help(pending who you ask) Word is on here that AE will be releasing their own big bore shocks, personally I'd wait the few months till they came out. If your real ancy about it, then do the losi spring conversion with the traxxas collars and losi cups. The kyosho shocks are really expensive, and even springs for them alone are expensive too. If money doesn't bother you, yea go ahead and the the kyoshos. I personally haven't used true big bore shocks yet(waiting for AEs), but I do use the big bore springs on my v2s. You'll here biased opinions of whether they work or if its worth it. I am a B main driver, very occassionally A-main, and I just learned to drive 7-8 months ago I think. From my experience, big bore springs, the car is smoother more consistant, seems to land better. Regular v2s, the car seems a bit more aggressive and dartier. So alot of people like the springs because the car feels better, is it faster, who knows. Some people say their laptimes picked up with the big bore springs, I couldn't tell you for me. I am still progressing as a driver so in general my times have been getting faster, and my lap times arent consistant enough to tell that I am picking up .6s a lap or whatever it may be. I can tell you if I picked up time on my fastest lap, but my thing is, like I said, too inconsistant, its offroad, there are so many factors, and realistically in my eyes atleast, unless you have a machine running the test, perfect traction, perfect laps no other factor, their is no way to really tell. Not between v2s and big bore springs, because the change in performance isn't huge where you might be like HOLY $H!T. This is all my personal opinion, some of the more experienced guys might disagree, and correct me if im wrong(please do). In the pits between races, if nothing is broke, I swap batteries, make sure no screws are lose thats it, and the A main guys, clean their tires, break down the whole car, some people rebuild shocks. I'm more focused on my ability to drive, somethings I'll never notice as a driver, so I dont bother to do, not yet atleast

Velvet shocks, $160 roughly, then you gotta buy alternative springs most likely.

Losi Spring conversion $20

up to you