The one I have on my CRX came out of the U-Pull-It yard. Dirt cheap and quiet.
When I first got it the muffler that was on it was very rotten. I cut and welded a pipe straight out the back on the right side. Used the pipe and flange that was on the old, rotten muffler. It wasn't TOO loud, and was on it when I got the best mileage out of it (52mpg).
You might be able to justify the cost of your own welder by the savings you would reap from doing the job yourself. I did that and I've used my welder a hundred times since then for all kinds of useful stuff.
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