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Tuning a V-Twin engine for optimal performance is never easy going on guesswork. It's best to assess what the engine needs, plan the work needed and work the plan before buying a single part or tightening a single bolt. If you're building an engine or doing your own tuning, to be competitive or just to get the most performance out of your V-Twin engine, it's a good idea to invest in a quality performance tuner to help take the guess work out of engine modifications and tuning, saving you time and money.