I would say that there wouldn't be any difference in power for the FIRST for 30mins.... the longer you drive the hotter your engine bay gets as we all know therefore putting more heat onto your exposed filter, therefore creating a loss in power.... If your using it for DAILY driving and doing long spirited drives, well then i don't see how it would be a problem but if your tracking your car i'd go a CAI instead... It comes down to personal opinion.. depends which one you want but to be honest.. rather have the filter hidden then be shown.
GruppeM IMHO is just as GOOD as INJEN CAI due to the fact where the air gets sucked from is a current flowing breeze in the direction your driving... Whilst a SRI with the pod in the engine bay, just sits there gaining heat... Fail...
CAI > SRI anyday...
If you want to modify your car IMO, i'd personally get the CAI but then again... some people can't afford to pay as much so your call....
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