Hi Zachary, I'm delighted to be able to help you. We have the 644148 and a match for the 645196 that will fit your 2006 Toyota Tacoma Pre Runner 6 Cyl 4.0L. Click on the 2 links below to complete your order at discounted prices while supplies last. I hope this is helpful. Enjoy your CarParts.com online shopping experience! 644148 (60% off) - https://www.carparts.com/details/Toyota/Tacoma/AP_Exhaust/Catalytic_Converter/2006/Pre_Runner/6_Cyl_4-dot-0L/APE644148.html?can=CPGG4850_CSQA_20221117 Rear passenger (26% off) - https://www.carparts.com/details/Toyota/Tacoma/Davico/Catalytic_Converter/2006/Pre_Runner/6_Cyl_4-dot-0L/DAV17222.html?can=CPGG4850_CSQA_20221117

Hi Zachary, I'm pleased to assist you. No need to call. I'll provide you with the necessary information. First - This part does not fit the 2006 Toyota Tacoma Pre Runner 6 Cyl 4.0L. We have the direct fit cats compatible with the vehicle. However, I could not give you a recommendation as you missed mentioning where you need it for. Second - Please check the Vehicle Emission Control Information sticker, usually found underneath the hood, to see if it matches the emission control specifications. Federal emissions (46-state) stickers will just say, "This vehicle conforms to U.S. EPA regulations." California-emissions (50-state) vehicles will state, "This vehicle conforms to U.S. EPA and State of California regulations." Third - Click on the link below (3 pages) to choose among the options we have available and order at a discounted price while supplies last. I hope this is helpful. Enjoy your online shopping at CarParts.com! https://www.carparts.com/search?q=Catalytic_Converter&filters[universal]=false¤tpage=1&vehicle[cylinders]=6&vehicle[liter]=4%2E0&vehicle[submodel]=Pre_Runner&vehicle[model]=Tacoma&vehicle[make]=Toyota&vehicle[year]=2006&can=CPGG4850_CSQA_20221117