Earlier I was reading about the URD Y-pipe and I had this to say:
Quote:
mr tibbs previously said:
I would be all over this except for one thing. I have a feeling most of us are going to need the cats that this replaces. I just put headers on my dads '05 Tacoma because the front cats were clogged. And since they were clogged it was a hell of a lot cheaper to replace the exhaust manifolds (that are welded to the front cats) with the Thorley headers. The headers were about half the price of stock manifolds with the cats. If I switch to this Y pipe then what do I do when the front cats clog? Are some of you guys already going without cats?
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So I had to do some digging and I found this:
The catalytic converter does a great job at reducing the pollution, but it can still be improved substantially. One of its biggest shortcomings is that it only works at a fairly high temperature. When you start your car cold, the catalytic converter does almost nothing to reduce the pollution in your exhaust.
One simple solution to this problem is to move the catalytic converter closer to the engine. This means that hotter exhaust gases reach the converter and it heats up faster, but this may also reduce the life of the converter by exposing it to extremely high temperatures. Most carmakers position the converter under the front passenger seat, far enough from the engine to keep the temperature down to levels that will not harm it.
Taken from
here.
This leads me to ask the question if Toyota knew this was a possibility why the hell did they make the front cat and manifold one piece?? I now understand why there are two cats per side, but seriously, if Toyota knew there might be a heat problem with the front cat why not make it removable and easy to replace? Wouldn't this encourage more people to replace the front cat instead of replace the whole manifold like I did yesterday? Thoughts??
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