I think the person is looking for more advise than just the overused term "custom". Getting something for less is not always the goal. Some people want quality too. Of course a cherry bomb will save you a fortune but you will be the laughing stock of the neighborhood. Cutting in a flowmaster will save a ton as well but they are made for V8's, not I4's. What custom setup do you have and/or what would you specifically recommend?Custom is the only way to go and is half or less the price of the injen. That way you can customize your own sound and your own tip. Good luck.