Hi guys,
Looking at getting an X-Force cat back system for my '09 4GEN 2.5 n/a Liberty Sedan, not sure whether to get the 2.25in or 2.5in and in mild or stainless steel. Any recommendations??
Stifull wrote:If money is not an issue, stainless is better although 2.5" on a non turbo may not provide enough back pressure.. I have a 2.5 Xforce on my 07 GT and it has a nice sound with out being too loud. If you are just getting a new one because the old one is damaged, I have the stock one of my 07 2.5 that you can have if you want it. It's in perfect condition. Located in brisbane..
Yowie wrote:Due to cost, mild steel tends to be thicker and therefore quieter than the stainless steel equivalent exhaust. Stainless can be a bit raspy-sounding. Stainless looks better and is usually more corrosion-resistant of course.
Most comments on the internet about exhaust sound (loud/quiet or great/rubbish) are so subjective as to be meaningless to the poor chap doing the research. Video (with audio) is better. A look/listen with a real example is best.
2.5" will flow better than 2.25" but have a bit more sound volume too. Better flow will allow better performance, although on a small-capacity naturally aspirated motor the improvements will generally be small.
("a car needs back pressure in the exhaust" is a myth that just won't die unfortunately - especially when we're far back from the headers after the catalytic converter).
Another option to save money is to run with a stock cat-back exhaust (or a replacement from Stifull) and talk to your local exhaust shop about some mufflers that have the look & sound you are after. Many exhaust shops will keep swapping mufflers for you until you are happy with the sound. Ditched WRX mufflers may be a cheaper option again if they fit the space.
In contrast, if you don't like your X Force choice you probably need to find someone willing to buy it from you "near new but discounted".
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