This kit is one of easiest and quickest methods to test back pressure. Drill a 5/32 hole, insert gauge and with the hose being about 10 feet long, you can sit in the cab and give the vehicle throttle. Results within minutes of getting tools out. This is much easier than removing an O2 sensor and putting an adapter back in. Any hole drilled will be plugged and doesn't affect operation or even noticeable.
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