Rich and All: There was an optional exhaust system (2.5" to rear) available on all 300D hardtops only. I have never seen it specifically stated that this system was standard with EFI, but have always kind of assumed it was. I obtained several 300D EFI exhaust pipes many many years ago from Chrysler Engineer Mike Kollins. (He was the man in charge of converting the EFI cars back to carbs.) These pipes are 2.5" diameter with the four bolt flange. They also have provision for a crossover pipe, which makes them different from the 390HP 300C units. I note that the crossover pipe is also listed in the parts book for "EFI 300Ds". However, no other unique "EFI" exhaust parts are listed. I am only guessing---but I think by the time this revision of the parts book was published, Service had decided to make available ONLY those exhaust parts that were absolutely necessary, and the very unique exhaust pipes with its crossover were the only three. If the rest of the system needed replacement, well, a suitable reducer would be used to adapt to the stock 300C/300D system. So, there is my input, for what it is worth! 300ly, Gil C. Today in sunny Tallahassee, Tomarrow in Albany, NY w/Grandkids In a message dated 5/29/2010 6:30:21 A.M. Eastern Daylight Time, c300@xxxxxxx writes: An interesting question from the Forward Look server: Date: Fri, 28 May 2010 11:11:55 -0400 From: DOLORES ECKERSON <eddee@xxxxxxxxxxxxx> Subject: CURIOSITY QUESTION ON FI 1958 CARS HELLO MEMBERS, and a happy Memorial Day Weekend Concerning the parts book and the 58 FUEL INJECTED cars........................ WHY would the FI cars have a separate P/N for the primary exhaust pipe from the exhaust manifolds????????????????????????? The LENGTH is the same for the CARBURETED cars The diameter must be the same because the secondary exhaust pipes are all the same. ANY IDEAS ED ECKERSON LI NY Rich Barber Brentwood, CA ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/