I am running the Losi RE11 pipe and I love it, the stock pipe is a dog. I am a die hard Novarossi +4 fan but I am starting to like the Boost alot. It is very smooth with lots of low end with the RE11 and I am turning faster lap times with it. The only thing I dont like is you go 1/4 hour lean and it just flat wont run but when tuned right it rocks. I have 4 races on it with zero flameouts and zero issues.