what is the difference in buying a catback system and buying a muffler and buying custom pipe from cat to muffler? also for my mods would 2.25" pipe from cat to muffler give me any sound or power?
A full cat-back is easier to install and usually gives better power and sound. Some people save money by getting a universal muffler and having a shop do the piping.
If you plan on just welding a universal muffler onto your stock piping, you won't see much in power gains. I can't say on sound because most universal mufflers sound like crap, but not all. Getting the larger custom piping will give you more performance and deeper sound. If you're really worried about it, spend the extra money on a Greddy or Tanabe cat-back. You'll be much happier.
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