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I think that plastic collar is suppose to be a heat shield. But I doubt it is very effective. I put something similar on my Denali, made it sound great under hard acceleration. Was suppose to give a 7-10hp boost due to increased Airflow.
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300C Briallant Black Pearl NAV,SGII,WOOD,PG,SIRIUS,UC
03' Ram 1500 Quad cab HEMI, NAV
03' Murano NAV
04' RX-8 6MT, NAV, Grand Touring
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