Re: 65 SS Chitvelle - My PT attempt
Since you're not looking for max performance you might want to consider 2-1/2" pipe after a long 3" collector extension. Its hard to fit an 3" pipe close enough to the floor on a 65 for it to be hidden, especially around the transmission crossmember and just behind it. X-pipe adds a nice tone to the WOT sound, that's if you can fit it in. I currently have Gorlich Xcelerator mufflers on my 65, straight thru design but super quiet cruising. I bought them from Pypes about 15 yrs ago, I think they make their own version now. If you want hidden exhaust you might consider painting it black, would blend in better. Its hard to hide the tail pipes on a 65, the quarter panel doesn't go down far enough to hide them well.
65 Chevelle, LS3/T56 transplant in progress
67 Chevelle, ZZ502, AFR 305, Straub Solid Roller, 400 Turbo, Moser Rear 3.42 gear