Black danner

A complete exhaust restriction is relatively easy to diagnose using the exhaust pressure gauge.. 2.5 at idle is already a red flag and then it buries the guage whenever the vehicle is revved to 2500 RPM..
Checking for partial exhaust restriction however is an entirely different case.. in most cases, you'd need an in cylinder pressure waveform or a pressure transducer in the exhaust to detect a partial restriction.

A basic and straightforward diagnosis.. you don't have to bring out the big guns all the time... Always start with the basics

The test light is my favorite and first go to tool. Unfortunately, it can't help you in some situations and this is one of those cases, so I bring in the big boys (oscilloscope), to get accurate and reliable data

A short clip from the video I’m working on