labor cost hours does it sound right?

That sounds like a fair deal to me. I paid just over $500 to have my Porsche Sport Exhaust installed at the dealership.

We agreed to 4 hours at $125 per hour (thier normal rate is $160 per hour). According to Porsche's Tech Bulletin it should have taken about 3 hours (that's all Porsche gives for warranty work).

Since this was the first PSE they have done on the new 987 Boxster, it took them closer to 7 hours. They ran into a couple of problems.