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I have an 05 E55 and want to improve performance. Can I do a pulley upgrade without adding anything else or doing an ECU upgrade.
Cost? How much does it improve performance?
 

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I have an 05 E55 and want to improve performance. Can I do a pulley upgrade without adding anything else or doing an ECU upgrade.
Cost? How much does it improve performance?[/QUOTE

You can do that but to get the most out of the pulley upgrade you should at least do an ECU upgrade. You will be amazed at the additional power that you get if you do that.
 
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