So ur saying a break in should last 1 to 2 gallons? Thats unheard-of I break my engines in in 5 to 6 tanks! I've had my engine for 2 years and it stll runs fine. The pipe I got is the Ofna (Ho Bao) Hyper 8 pro polished tuned pipe i'll be getting it very soon. Hey My RC suply what kind of r/c car do u have and what engine is it?