stock cat back weight

From G35 driver:

Stock Ypipe - 11lbs
Midpipe - 8lbs
Rear Canister/muffler- 30lbs
=49lbs

Since ours has longer tips..50lbs is about right.
 
Actually just found this from G35driver: http://www.stillen.com/media_files/attachments/0000000007.pdf

Exhaust Shootout FROM A 350Z...Stock, Stillen, Nismo, Borla, 5Zigen, Injen

Stock:We used the stock exhaust, obviously, as our baseline for the test. Nice exhaust note, and unless you have to replace your “old”
one, the system is totally free. As expected, this was the quietest exhaust both at idle and at cruising speeds
MSRP.............................................. $854
Weight........................................... 64 lbs
Tip Diameter .................................87mm
Piping Diameter ............................60mm
Sound Decibel at Idle......................81db
Sound Decibel at 3K rpm ................89db
Peak Horsepower..................... Baseline
Peak Torque ............................. Baseline
Warranty ...........3 years or 36,000 miles
Ease of Install....................Easy

5Zigen:The only non cat-back system we tested, the 5Zigen is by far the lightest-weight system in the group. It’s also the loudest, providing 105db of ear candy, which for some buyers will make up for the loss of overall horsepower. 5Zigen is the only manufacturer that can mandrel bend 1.5mm thick pipe.
MSRP..........................................$1,400
Weight......................................... 25 lbs
Tip Diameter ............................... 86mm
Piping Diameter .......................... 58mm
Sound Decibel at Idle.................... 87db
Sound Decibel at 3K rpm............ 105db
Peak Horsepower ......................... (-3.4)
Peak Torque .....................................0.2
Warranty ........................1 year, limited
Ease of Install ..........................Medium

Borla:For the price, the Borla exhaust offers the maximum straight horsepower-to-dollar benefit. It has a clean look—nothing too radical—and has the loudest rumble at idle, perfect for waiting in line at a drive-through. This kit does consist of the most pieces (17, compared to 3 or 4), and took the longest to
install.
MSRP .......................................$845.99
Weight..........................................52 lbs
Tip Diameter ............................. 105mm
Piping Diameter .......................... 60mm
Sound Decibel at Idle ....................88db
Sound Decibel at 3K rpm ..............92db
Peak Horsepower .............................8.2
Peak Torque ...................................2.72
Warranty .......................1 million miles
Ease of Install ................................Hard

Injen:Injen tried a few different systems and found the 50mm piping diameter worked best. Nice, balance power band. Those who don’t like the flared-out style—but like everything else—Injen will be releasing a more conservative straight system. Comparing systems on each car, this was the best looking in terms of finish.
MSRP.............................................$975
Weight......................................... 49 lbs
Tip Diameter ............................. 100mm
Piping Diameter .......................... 50mm
Sound Decibel at Idle.................... 83db
Sound Decibel at 3K rpm.............. 99db
Peak Horsepower .............................7.6
Peak Torque .....................................5.1
Warranty ..................................... 1 year
Ease of Install ............................... Easy

NISMO:Perfect if you like the stock sound but want something louder. This is a nice overall quality system with a Nissanbacked full warranty if installed by the dealer. The NISMO system was the easiest for us to install. And as for as looks go, imagine the stock system dipped in platinum.
MSRP .........................................$1,100
Weight..........................................54 lbs
Tip Diameter ............ oval, 96 x 107mm
Piping Diameter .......................... 76mm
Sound Decibel at Idle ....................84db
Sound Decibel at 3K rpm ..............95db
Peak Horsepower .............................6.3
Peak Torque .....................................4.5
Warranty ........ 3 years or 36,000 miles
Ease of Install ................................Easy

Stillen:They dyno graphs show the Stillen exhaust producing the most consistent power band with lots of torque. Stillen tried four to five different exhaust designs before being happy with this one. One of the only drawbacks is the weight, which is more than the stock system.
MSRP..........................................$1,150
Weight......................................... 74 lbs
Tip Diameter ............................... 97mm
Piping Diameter .......................... 60mm
Sound Decibel at Idle.................... 84db
Sound Decibel at 3K rpm.............. 93db
Peak Horsepower .............................8.1
Peak Torque .....................................7.3
Warranty .................... Lifetime, limited
Ease of Install ............................... Easy
 
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