« on: Jun 29, 2010, 09:50:02 PM »
Add a restricter after the cat to add backpressure... (about 3/4" hole).
The backpressure will help with EGR which will reduce NOX
Take out after test.
Really? Will that drop it 400 PPM? Are you talking about a plate with a 3/4" hole bolted between the flanges or a smaller diameter section of pipe?
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