Don't believe the sales ads man, a good .28 will put a beating on that OS.30... and cost less too. Alot of people say the OS is a monster after modding, and I believe it considering the VERY basic design of the engine components... there's TONS of room for improvement. That's fine if you are an experienced engine modder, but to have it sent out and modded is going to cost more than just buying something like a Novarossi 528. A $130 SH Prospec is stronger than the OS.30 in stock form.