It's totally up to the individual officer and thier atitude toward those with radar/laser detecting equiptment.
Personally, I find it somewhat humorus when I stop someone with a detector for speed
I've actually had them tell me "you couldn't have gotten me, my detector never went off!"
My response is usually along the lines of...It's probably broken...be right back....
The exhaust question really boils down to which statute is used and again, as C5Statetrooper implied, the officers attitude. I've never written one for a well modified exhaust. If I did, I'd have to start with myself
However, the statute can, and on occasion is used as PC to stop a vehicle in order to further inspect for "safety violations."
Really depends on the officer.
Oh, BTW...Hey Larry and welcome aboard bro
Gordon