[bluebikemike]

The risers are made by Marine Exhaust Systems, as Mikes above, but they were/are original equipment from Tiara. So, I haven't had to replace them as of yet but $2125, IMO, is a good price. 

Mike, why were your replaced? Did they break?Leak? 

As the original owner, I was notified by Tiara that the OEM risers needed to be replaced (a field service campaign), and was handled by my dealer, Allied Marine.  This was back in '02 or '03.  Tiara paid for it (a good thing!).

Recently, we started to smell diesel exhaust in the cabin while underway.  Investigating, our technician found a crack on the port engine riser and some small leaks on both sides, and recommended replacing.

I think 12 to 13 years is a great service life, as my engines have over 2900 hours on them.