Is there anyway to get some more power out of the accord without spending a bunch of money to swap a motor or anything like that?

The car has a fresh 2.2 liter (atleast im pretty sure thats what it is)
Its got a funky looking somewhat large air intake made by some company called "Focuz", wich ive looked for but cant find anything...its got one of those cheapo looking cone style air filters, which looks kinda dirty.. Its also got a DC Sports 4-2-1 header, and a stock muffler (in the glovebox was a reciept for a new stock muffler, with a ticket for 'amplified muffler' stapled to it, wich also had a tick mark in the 'corrected' box on it)..

Since im more of a domestic guy, im not very knowledgable about all the engine terms and types (like b18 and all such other ones), that go with hondas.


So i was wondering if there is anything little performance things to do, like a catback system, one without a huge muffler (if you can call it that) and a 4" tip. I know this is the g/f's car, but she hats that too..is there any alternative to have a big dumb sounding exuast? Alot of people say that a quality one doesnt sound really stupid and farty, but in reality they all do

Thanks, Trevor