Arnie's first Pontiac race car featured a set of Bill Wirges custom built fenderwell exit headers - easy to come by if you had a SBC powered 55-57 Chevy, but not a 58 Pontiac.
The Passionate Poncho's - there were three of them.
The SD 421 transaxle coupes and wagons ran well
but but were very high maintenance.
New pictures at the bottom of the page.