Been researching the high flow y pipes and found that my 99 should have a 2 in 1 out cat close to the headers. Thats not whats under my truck. I measured the smaller pipes to be about 2" going into about a 2.5" then straight past the cross member to the cat. Now that I've been reading im pretty sure a shop did this by the p/o. Seems like I don't need to upgrade my y pipe anymore. What do you guys think about this setup