+2 on rb's. I use to have vpecs and I really didnt like them. Made decent power but they are short lived. I now have a rb s7 l2g, I only have 3/4 gallon on it so far but it flies. And it still has tons of pinch. It holds a tune very good and it is easier to tune than my vpecs I had so far. You can buy the engine much cheaper than 300.00. As a matter of fact I bought mine from amain hobbies for I think 340.00 and that was with the 2045 pipe and header. But they sell the engine for 269.00. Very hard to beat this engine for the price