My motorhome is a 1995 Class-C Ford E-350 with a 460 EFI engine...I have upgraded the exhaust with Thorley headers following the dreaded exhaust leaks and snapped bolts...I am now ready to upgrade wit...
Be prepared for an increase in intake noise when you install it. Not sure if it applies as much to the E series but I had one on my F250 and it was significantly louder than stock. The up side is it was a pleasant sound for a motorhead like me.