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Random Technologies has a pretty good cat. I'll see what kind of prices I can get on a few if you want, to let you know what you're looking at and compare performance to price.
And your timing can screw some things up if it's off. Make sure you set it or let someone set it where it goes as soon as you can. It's not gonna blow your engine (unless you are spraying) but it will affect your performance and gas milage. Even if it's only off a few teeth. Each tooth makes a difference.
I just noticed that you said valves. You should get those adjusted at least every 40,000 miles. It helps. If it hasn't been done recently, you will probably hear them, especially when you pop the hood. Getting them adjusted properly will make your engine run more quiet.
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