all Im doing to my euro is a injen cai and this exhaust.. you rekon I'll be right with the 2.5 inch from the cat?..
to be honest, if all you have is an injen intake, installing a 2.25 or 2.5 inch catback will almost result in no performance gain, ive tried it before and felt no difference.
Even a high flow cat would give you more gain, and like others have said change the headers and you will definately feel a huge difference. If you are after sound, you can change the mufflers.
But in regarding to your question, a 2.5 inch setup is better as it will give you more flow, but i think you should change your catback after you change your headers/cat because no point having a bottleneck in between, if you dont plan to change headers than dont bother changing catback, it will be a waste of money
the stock exhaust has good flow..so no need 2 change if ur afta performance..as many others have said do headers and cat first to improve performance. changing de cat for me made the most noticeable difference.
my muffler guy told me the Exhaust is fine as is and making it bigger is a waste of time and money but the mufflers at the back restrict it and changing them will make it sound nicer but also improve Ever so slightly
i have just muffler done at the moment and Extractors and Cat will be next some time lol
List of parts added
- Exhaust system - Custom CAI setup - K&N Air Filter - Rockford Fosgate Speaker setup with punch 2 Subs - J's Racing Front Strut bar
Originally Posted by Nathn
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