First off that looks like the factory pulley to me, which doesn't necessarily mean that it's not pullied. It could have a lower pulley installed. Second the 03/04 cobra engine can take much much more than just a simple pulley swap in stock trim. They come with forged internals from the factory and are quite strong. I am running a stock bottom end with a whipple @ 17#'s of boost and have no troubles at all. My car makes around 600 RWHP. With the right tune and supporting mods stock cobra engines have been known to make 600+ reliably for long periods of time. I read on another forum that a guy put a whipple like mine on his stock cobra (with the supporting mods of course) @ 9500 miles, drove the car daily and logged 90,000 on the clock. He did a compression test and it was perfect, he also strapped it on the dyno and was making more power than when it was originally tuned @ 9k. i would not be scared of buying a pullied cobra. Just make sure it has had a good tune and no sighs of abuse. A simple leakdown test will give you an idea on how good the engine has been looked after.
__________________ |2004 Silver Metalic Cobra # 3118 of 3768|whipple Gen 2 140ax|LFP single blade TB|3.00 Pulley @ 17#'s|BF 4 piece idler set|FIPK CAI|60# injectors/with harness|LFP cooling mod|LFP duel pass H/E|LFP Reservoir|MAFia|Ford GT pumps|Mcleod RST street twin|Steeda clutch quadrant|UPR firewall adjuster|IRS Brace|H&R race springs|BBK subframe connectors|BBK o/r X-pipe|Magnaflow Catback|Tuned @ the mustang shop w/ SCT xcal2| 11.338@130.81 on 18" rims and Nitto 555R's 
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