i have been running the Jammin engines since they came out and i like the JP1 or JP4 if its a very large track. i have heard that the 053 work resaly good but i have never tried it. BUT i would remomend the JP pipes because they are so durable. one hit from someone with alot of pipes out there and your stinger is bend in or the pipe has a giant dent. plus the JP pipes come with a spring pipe mount.