VOETOM
Well-Known Member
68 you can fit 20" but it is tough then for inlet and outlet pipes to fit. My home made VOE ones are 19 and stock use 18" body units. I used to run some Cadillac ones that were huge. They were from a single exhaust 1975-76 Eldorado and 21856 is what it was. It used to be 4.5" by 11", roughly, with a 19" case size. Now they are only 4.25" by 9.75" by 19" so they fit better. I'll find you some numbers in addition to the ones I listed if there are other potential candidates.
[ame="http://www.ebay.com/itm/Walker-21856-Exhaust-Muffler-/400712737785?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1976%7CMake%3ACadillac%7CModel%3AEldorado&hash=item5d4c5723f9&vxp=mtr"]Walker 21856 Exhaust Muffler | eBay[/ame]
Tom
[ame="http://www.ebay.com/itm/Walker-21856-Exhaust-Muffler-/400712737785?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1976%7CMake%3ACadillac%7CModel%3AEldorado&hash=item5d4c5723f9&vxp=mtr"]Walker 21856 Exhaust Muffler | eBay[/ame]
Tom