If you have the dough, splurge for 2" after the "Y". Should help it breath a bit better. I always run "turbo mufflers" from Summit. They are still baffled, but give an increase in flow as well as a slightly more aggressive sound w/o being obnoxious. Very inexpensive muffler too. Auto Zone has a clone of it (think it's Thrush's "turbo muffler") and if you can find Summit Racing's price for the same thing online, Auto Zone will price match. They don't last forever, but have a decent sound and MPG will bump up a point or 2.
Also, be aware running cat-less on some cars will cause CEL unless you stack the 2nd O2 with anti-foulers. Also, since it's a federal law to have a cat, some places will refuse to work on the car with the cat omitted, and by law they are required to replace with OEM (so in your case ej25) before doing anything else. Although the EPA doesn't aggressively go after people that are running cat-less, a sharp-nosed cop can and the fines are super expensive (like $10k IIRC with possible jail = felony). Also, if you ever sell the car w/o a cat, the buyer can come after you in court and seek judgement for the cost of an OEM replacement unit plus labor, which would be the entire "Y-pipe" section (same rules apply to dealerships). This post would sink you if the DA found it. Play it safe and stick a $90 universal cat on meant for, or rather safe to run on the car, or just leave the EJ25 exhaust in place if it bolts up the same. It won't hurt anything.
Edited by Bushwick, 16 December 2013 - 11:20 AM.