FYI, From 89TTA.com
The Walker TTA 3" cat-back exhaust system consists of these parts:
Walker Part #44074 First intermediate pipe
Walker Part #43248 Over-axle pipe
Walker Part #17296 Muffler
Walker Part #44279 Universal Tailpipe
Or, for a mandrel bent 2 1/2" cat back system under a single part number:
Walker Part # 17494.
For more information call Walker Dyno Max Tech Support at 810-852-9347