In general, you can expect a Honda Civic SI turbo kit to cost anywhere from $1,300 to $3,800, depending on the seller, quality of the kit, and contents.
KSeriesParts.com, for example, sells a few Honda Civic SI turbo kits—the REV9POWER 2002 - 2005 Civic SI Turbo Kit is their cheapest and sells for approximately $1,300, whereas the REV9POWER 2002 - 2005 Civic SI T3T4 .63 AR Turbonetics Turbo Kit is their most expensive and sells for roughly $1,730.
If you money to spend, you might opt for Vivid Racing’s Turbo Specialties HC2505EU T25 Extreme Turbo Kit for the K20 2006 - 2011 Honda Civic SI, which sells for roughly $3,800.
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