Check the bottom of my first post of the B14 aftermarket exhaust thread. I just added a bunch of new information recently.
Some of it a lot of you folks will know but a good read through can show you something new. You never know.
http://www.sr20-forum.com/200sx-se-r/32739-b14-aftermarket-exhaust-kit-system-choices-direct-bolt.html
Here are new mufflers I have found that are pretty even as far as inlet and outlet measurements and locations. Price varies from $40 to $65 for the mufflers I found on the same web site.
Turbo mufflers are not a straight through design so an increase in backpressure will happen. Results and how much will vary. Here are the best options I have found so far from some heavy hitters in the exhaust muffler industry that utilize similar properties/technologies/style to decrease overall noise while cruising.
Summit Racing - Thrush Turbo 17718
Photo:
Thrush PDF Other Link:
Info about Thrush turbo mufflers in PDF and some here
Inlet/Outlet Size: 2.5in./2.5in. Center/Offset
Body Shape: 4.25in. x 9.75in. Oval
Core Size: 2.5in. via three chambers
Body Length: 20in.
Overall Length: 25in.
Summit Racing - Cherry Bomb Turbo 87752
Photo:
Info about the Cherry Bomb Turbo mufflers and other sizes
Inlet/Outlet Size: 2.5in./2.5in. Center/Offset
Body Shape: 4.5in. x 9.75in. Oval
Core Size: 2.5in. via three chambers
Body Length: 14in.
Overall Length: 18.5in.
Summit Racing - Dynomax Super Turbo 17733
Photo:
Info about the Dynomax Turbo mufflers and other sizes
[img][IMG]http://www.dynomax.com/skin/frontend/default/dynomax/images/mufflers/landing_st_main.jpg[/img][/IMG]
Inlet/Outlet Size: 2.5in./2.5in. Center/Offset
Body Shape: 4.25in. x 9.75in. Oval
Core Size: 2.5in. via three chambers
Body Length: 14in.
Overall Length: 18.5in.
Summit Racing - Magnaflow XL Turbo 13256
Photo:
Info about the Magnaflow XL mufflers and other sizes
Inlet/Outlet Size: 2.5in./2.5in. Center/Offset
Body Shape: 4in. x 9in. Oval
Core Size: 2.5in. via three chambers
Body Length: 18in.
Overall Length: 24in.
The Thrush has the largest volume , followed second by the Magnaflow XL, then the Cherry Bomb and last is the Dynomax of these four turbo mufflers that all utilize three chamber technology, 2.5" center/offset mufflers.