what is the difference between the Agency Power Cat-Back and the Greddy Ti-C exhuast? does this remove the cat? any preferences? which one is the most power gains? suggestions appericated.

 

The Agency Power Cat-back replaces everything AFTER the s-pipe. Meaning your 2nd smaller cat will be non-existent. The piping for the AP is 2.25" inner diameter(the only measurement I made this at was at the rear section connecting point). This setup will get you more power than the Greddy Ti-C because the Ti-C is just only replacing the rear section of the exhaust( the muffler). I have the Agency Power myself and finally got it installed on Friday last week. The system is completely bolt on and recommend having a friend or family member help on getting the muffler set to clear the bumper like you'd want. I have some under car pics of it installed and plan on putting them up later on. I want to dyno my car again to see the gains but that my have to be put on hold for maybe two weeks. I'll most likely do one run cuz where I go to they don't have a fan to blow any air towards the engine bay, and the runs are done kinda quick back to back.

One member's AP exhaust on their car
https://www.scionlife.com/forums/vie...asc&highlight=

Another AP install
https://www.scionlife.com/forums/vie....php?p=2388113


Greddy Ti-C
https://www.scionlife.com/forums/viewtopic.php?t=170119