okay well i saw something about a guy doing his exhuast, and he was giving out all these readings of backpressure, how do u guys measure that, a boost gauge jerry rigged?? id like to know for my car

Thanks!!

You need to mount 2 pressure sensors. One at the beginning and one at the end of the tube/rout/exhaust where you need to measure backpressure.

THis might be on the down pipe right after the collector and at the end (say right before the final silencer). The difference in pressure between the two sensors is the backpressure.

you can get differential pressure sensors that have a tube to both sides of the silicon slice that supports the sensor.

Mike