Well if there aren't two collectors then my only recommendation would be to call a vendor before you buy and see if a 99 and older manifold will work. It should mount the same way, the only thing I would be concerned with are the exhaust ports and the location of the downpipe.
2014 Jeep Wrangler Sport S
3.6L V6 - Manual
2001 Jeep Cherokee Sport
4.6L Golen Engine Stroker
6.5" TnT Customs Longarm Kitl Ford HP D60 l 6.5" Rock Krawler Coils l TnT Customs HD Trac Barl Omix Ada HD SYE l 1" UBEsl CV Driveshaft l39.5" IROKsl 17x9" Pro Comp 98sl High Clearance Shock Mounts [COLOR="red"] l Hidden Hitch l AJs Custom Front Bumper l SONY Xplod stereo l Alpine Speakers l TnT Frame StiffenerZ l 22" RE SS Brake Lines l 1.5" TnT Customs Boomerang Shackles l Sterling 10.25 *FULL WIDTHS* l JKS Mini Skids and Sway Bar Brackets l 7/8" Heim Joint High Steer