DC Sport CAI for 03 I4 is a good product. I have an 08 GS and it fits my car perfectly. Only thing is I have to customize it a bit to fit my MAF. Only cost about $10.00 for a new coupler and some clamps at auto zone. CAI gives a nice deep sound when stepping on gas. Dont really notice any gains HP wise until your reach higher RPM as with any other CAI. Over all good product for its price so its a good cheaper alternative.
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