Cats..????

[Rroop32]

so about a month ago i noticed my truck sounds like its baffled. The exhaust tone has deffinetley changed. Like I said it sounds almost like its being restricted. It has a Gibson Cat-back single in single out. Ive put it on a lift and banged on the cats but they dont rattle or make any abnormal noises. But I have not removed them. it also feels as if its underpowered, to the point where it wont even brake lift. really starting to irritate me. Any one got any ideas?

Thanks

 

[machinehead]

Air cleaner?

 

[Rearanger]

If you think there's a blockage in your exhaust system then a vacuum test should indicate that.