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This is the MP 5 90 Size Muscle Pipe from Curtis Youngblood Enterprises. The latest addition to the Youngblood Products line, The Muscle Pipe 5 90 provides more power than the previous version, and at a higher RPM band.
Features: - Works with OS and YS engines
- Works for 70 - 90 size engines
- Works well with or without a governor
- Includes all mounting parts for OS, YS and Thunder Tiger
- Mounting works on forward or rear facing engines
- Increases power over standard mufflers by .3 - .5 hp
- Runs well on nitro levels from 5% to 30%
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