Hi all - I just picked up a 1964 Buick Wildcat convertible, auto with 401. It has dual pipes back to large muffle that sits transverse under the car. I'd like to install true duals back to exit under the rear bumper or sides. I found one on ebay for a 1965 that looks like what I want, but not sure it will fit. Looking for any suggestions for off the shelf exhaust. I can always take it to an exhaust shop but would like to save some money if I can. Thanks!