We are now carrying a 3" polished stainless steel catback exhaust system for the Turbo Regals.  All hardware and clamps are included.  Mufflers are a straight thru design for ultimate flow.  I just finished installing one of these systems on my own GN.  Did it in my garage without a lift, can be a little tough to do but it is possible.  If you have access to a lift it would be a lot easier!  Some trimming of the pipes and your downpipe MAY be needed.  My GN is lowered quite a bit so if your Turbo Regal sits at stock height you should be fine.  Sounds really nice!  I just upgraded from a Hooker 2.5" catback system and it is louder than that system but NOT obnoxious at all until you really hit the gas!  As a bonus, this system is actually about 18 lbs lighter than the Hooker system it replaced!

May be some interference with drag style rear sway bars that attach to the frame due to  the end link location.  Will work fine with all stock style rear sway bars.  Below are some pics from a customer who has successfully installed this exhaust system with the HR Bar.

Below are some more closeup pics of the above installation.  This customer states that he did not have to modify the system to get it to fit with the HR bar.  Your installation may vary.
Click on the pics to see full size.

Below are some pictures of the installation on did on my own GN.  Notice that I used stainless steel step band clamps at all connections.  I recommend using them as it makes it easier to adjust the system and to remove it intact if so desired.  The traditional clamps you see in the pictures below were just used for the hangers.  I am now offering the step band clamps as an option in the drop down menu below.  If you choose this option you will receive 4 of the band clamps in addition to the regular clamps included with the system.