For those using the new high flow intake packages on the Sea-Doo RXP or SC 4-TEC, it is advisable to use one-heat range colder plugs. These are $11.99 each though either www.sparkplugs.com or www.deniskirk.com just search for part ixu27. The help prevent detonation from the slightly leaner air/fuel mixture.
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IXU27 Denso plugs for RXP/SC 4TEC
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