does this really work?

[cargod22]

http://www.stylintrucks.com/parts.aspx?category%7ccategory_root%7c-28=Performance+Parts&category%7ccat_-28%7c111=Air+Intakes&canned_results_trigger=&selected_prod_ids=1160&qid=STYLINDEV04_i01-070908-20:40:11-455086