The TA/AAR headpipes are designed differently at the rear than the regular 340 headpipes. The TA/AAR headpipes are shorter , more inboard towards the driveshaft and angled downward to allow the TA mufflers to hang lower. The regular 340 headpipes are longer at the rear , are positioned more outboard and are angled upward to allow the center in center out resonators to be in line with the over the axle pipes. The exhaust manifold end of both pipes are the same. Hope this explains the differences between the two.
