LOL. A good tune will keep the engine from bogging on acceleration. My truck rarely bogs, even when I hammer the throttle after it's been sitting for 30 seconds. When a nitro's tuned right, you'll know it and it'll last a long time. Sounds like scammers. Just like that little electric "supercharger" someone was selling for full-size cars/trucks a while ago. "Just stick it in the air intake tube, hook it up, and experience up to 10% increases in mpg and hp with no parasitic losses like belt driven varieties, for only $269.99." Or you can just replace your air filter with a high flow model and get the same results for $50.