Been testing the new Mephesto engine. I have not tried it with the 2135/41021 combo yet. I used the 9901/21 header combo which is supposed to be about the same effect. The engine is really easy to tune and drive. The engine has a very smooth bottom, with a strong mid and top range. Pulls really hard and will put the length of your front straight. The taller engine head will keep the engine cooler while still producing good power and mileage.

Rolling, I have used the 2096/41021 header. This is a good crispy combo for this engine. I ran the Rolling in truck, I used the 41031 header. Got great mileage and still plenty of power. 2135 header will reduce the top speed a lot in the Rolling. just chokes it back to wear you have to lean out the engine.