I second that one! When I first built my cub I couldn't find any good pipes so I ran it with T5 pipes and my 33's. Yeah, it was an animal but it was like making that thing try and exhale through a straw. I finially got the CPI's and it woke that beast up.
If you expect to do any kinda trails you should really consider ported stock cylinders because the cub will just have too much of the wrong kinda power for trails. Yeah, you can ride it on trails if you are good, but you will be doing nothing but riding the clutch, on and off the gas, hitting your brakes every time it gets in the powerband. Cubs hit like a freight train all at once, not really good for trails. They are great for the dunes though, but even still I would prefer something with powervalves for just recreational riding.