some of you might recognize this project im working on. the y pipe is shot but which one is it??? this was a 85 blazer 2.8l v6 4x4 that has a 4.3L v6 from an 89 put in it. the pipe in it now has no cat in it everything is after the y pipe. i have to double check for any 02 sensors. or maybe you guys would know there are none. im looking at the walker exhaust catalogs for the two years and for the 85 they only give me one option for the 4x4 y pipe # 40310.. for the 89 4.3l they show a #40202 and a 40212. you guys might know better than i that the one option from the 85 is not interchangeable up the the 89 4.3L then i would just be narrowing it down two the two from 89. thanks