Yeah, stay away from them. They are dodgy. A downpipe is a big and expensive job and will only change the note a little. If you just want a bit of sound, a catback exhaust is what you want (I'd talk to 2xs or failing that a local exhaust shop). If you don't want to go all out, you could just upgrade the muffler alone to something like a magnaflow (great sound) and/or delete a resonator. Removing the second cat is also easy, cheap and will net you decent power as well as sound.
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