did you buy it off ebay?

 

Of course this cat back will increase performance, its a bigger diameter pipe, with a free flowing muffler. Im not in in it just for the sound, how ever sound is important, besides with a muffler this size it wont be too loud. Yes, I did get it off ebay, but the box it came in had the official tsudo logo, so did the muffler.

 

how quiet a muffler is isnt all based on size