i dont really agree man^ i think a cabtack on an N/A car is worth it. Sound and perfroamcne will both be really good, and yeah you'll notice it alot more with a boosted cat, but i think an N/A catback is deifnaely worth it. GReddy Evo 2, Apexi WS2 and Magnaflow CatBack are all available on Ebay, but you can do a custom one for cheaper. You'll have somethin nobody else has, and you get the sound and performance you want

use the Search feature up there ^ if you want more info on the custom Catback.