I found a NOS set of Doug Thorley "Showpipes" (sidepipes) on Ebay last year. Even though they are 20 years old they came in original box and look/sound brand new. I mated them to my brand new 350 v8 in my 1950 3600 pickup. They're mounted below the running boards and look great, plus they sound great too. Low rumble like the 60's/70's Vettes with sidepipes.
Amazing what you can find on Ebay.
