All Celica Exhuasts are Axle back.. But you can get a custom one
Kazuma, Tanabe, and Greddy all make catbacks for the Celica.
If you can afford the C-One, get it.
Keep in mind you'll be able to sell it for $100 less than you pay for it.
C-One is most likely just a rebadged exhaust with a jacked up price, like most of their their other parts. They rarely make their own parts (just like TRD
i have yet to see dynos for Fujitsobo, or C-One...
Fujitsubo has dyno results on their site:http://www.fujitsubo.co.jp/search/prod-v.php3?prodID=000000000000001035&cnamID=00000256
Their exhaust makes only 5hp, but is the quietest by far for the Celica. Just about unnoticeable inside or outside the car, and you'll never have to worry about cops noticing it. If you're going for quiet, Fujitsubo is what you want. If you're going for power, TPR is what you want.