To whoever has an OS 18 CVR engine in their nitro evader: How much power does this engine have over the stock 18? Can you actually notice a difference? I did notice it's about $100 dollars cheaper than the TZ. Also has anyone heard of tntmods.com? I see they machine rc engines for more power and efficiency and I'm wondering if anyone has had an engine modified by them. If they did can you relay your experience?