has any one seen this exhuast... i cant' really tell from the picture... but is the tip dual layered? or is it just a single layer pipe tip...

 

I don't know anything about this exhaust for the Prelude but the one for the ITR has abottle neck at the B pipe flange.

 

The Hyper exhausts are single-wall tips. The only dual-wall that Tanabe had was the G-Power and they discontinued that one. And all bolt-on exhausts have a bottle-neck at the cat cuz they're made to bolt-up to the stock cat. I've never seen a bolt-on exhaust made to fit a stock cat not taper to fit the cat-bolts, and I've seen a ton of exhausts.