Michael Cosky's 1966 Buick Skylark.
He had this to say about his Pypes Exhaust:
Last winter I installed a Pypes 2.5 inch cross over and Pypes tail pipes with turn downs on my '66 Skylark with a 455. I hate to say I used "other" mufflers as I was familiar with their sound and could pic them up locally. With the Pypes hardware the installation was painless.
Last year with headers and the stock 2" exhaust with no name mufflers I ran a best of 12.98 @101 with a one time 1.74 60 ft. This year even though I couldn't get my 60 ft below a 1.84, I still ran a 12.78 @ 106. If I can get my 60 ft back I'll have picked up over 2 tenths with just the exhaust and a switch from 3.08 to 3.42 gears. I have to say I'm pretty happy.