The outlet tips on 5-liter naturally aspirated engines are 65 mm in diameter out of the rear mufflers, those on 5-liter S/C are 70 mm and finished with a chromed stainless steel sleeve. That's the only difference between the two exhaust systems, which are otherwise identical from cats all the way to rear mufflers. So, it should be possible to swap the tips but some welding will be required to fit the large diameter S/C tips to the smaller rear muffler outlet of the HSE exhaust.