Join Date: May 2008
Location: Bay Area, CA
Model: LS w/B18C1
Feedback Score: 5 reviews
one easy way I found to check for an exhaust leak....
Take a thin rubber tube around 1/8" diameter, 3-4 feet in length. Hold one end in your right hand, and put the other end in your ear.
With the car running, move the end of the tube around the interface between the manifold and head. If you hear a fast-paced ticking noise, then you have a leak. Exhaust gases come in pulses, so you'll hear repeatable pulses coming from each cylinder.
If you hear that, you have a leak.