Wrong! A popular legend I believe the Sono 6x replaced the 4X later but I have boxed multiples of the original MoPar 4x that are 35 inches long with the correct inlet 2 1/4. 4x is no indication of length or inlet outlet dimensions. I believe that the 300 came out of the factory with OEM plain mufflers so since they are not the OEM muffler anyway I believe either 4x or 6x for a 300C is fine; as long as the dimensions are correct. I have original MoPar catalogs for the 4x with application. It appears to refer to an engineering level or improvement..not the length or application. Perhaps the 6x was catalogued in 1959 succeeding the 4x. . I do not have a 6x MoPar catalogue with the application. Marv 300C and 300D and 57 Fury....all with Sono 4X's In a message dated 8/9/2012 11:05:26 A.M. Eastern Daylight Time, chesnutt@xxxxxxxxxxxx writes: Hi 300C & D Owners, Don't get too excited about the Sono 4X mufflers. Original equipment mufflers on your 300C & D's is a "MoPar Sono 6X" with a body length of 34 inches. The Sono 4X is 29 inches in body length. John Chesnutt, 300C, Portland, OR -----Original Message----- From: _Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) [mailto:_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) ] On Behalf Of David Schwandt Sent: Thursday, August 09, 2012 5:33 AM To: Larry Jabin; _Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) ; Ronald Kurtz Subject: Re: [Chrysler300] Mufflers on Ebay $$$$$$$$$$$$$$$$$$$$$$$ I guess nothing is too good for a trailer queen!! ----- Original Message ----- From: "Ronald Kurtz" <_mark6268@xxxxxxxxxxxxxx (mailto:mark6268@xxxxxxxxxxxxx) > To: "Larry Jabin" <_larry@xxxxxxxxxxx (mailto:larry@xxxxxxxxxx) >; <_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) > Sent: Thursday, August 09, 2012 7:05 AM Subject: Re: [Chrysler300] Mufflers on Ebay $$$$$$$$$$$$$$$$$$$$$$$ Hello, everyone: I agree about the $$$$$$$$$$. I bought a pair of NOS Sono 4x mufflers in 1993 from member Mike Burke for only $102. I believe they were the last two he had at the time. Thank goodness for club members. Best, Ron Kurtz E #292 ________________________________ From: Larry Jabin <_larry@xxxxxxxxxxx (mailto:larry@xxxxxxxxxx) > To: "_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) " <_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) > Sent: Wed, August 8, 2012 10:29:28 PM Subject: [Chrysler300] Mufflers on Ebay $$$$$$$$$$$$$$$$$$$$$$$ _http://www.ebay.com/itm/1956-1957-1958-1959-Chrysler-Plymouth-Dodge-DeSoto- NOS-Dual-Mufflers-/271031389975?hash=item3f1abacf17&item=271031389975&pt=Mot ors_Car_Truck_Parts_Accessories&vxp=mtr#ht_500wt_1203_ (http://www.ebay.com/itm/1956-1957-1958-1959-Chrysler-Plymouth-Dodge-DeSoto-NOS-Dual-Mufflers-/27 1031389975?hash=item3f1abacf17&item=271031389975&pt=Motors_Car_Truck_Parts_A ccessories&vxp=mtr#ht_500wt_1203) Larry Jabin _Larry@xxxxxxxxxxx (mailto:Larry@xxxxxxxxxx) <mailto:_L.jabin1007@xxxxxxxxxxx (mailto:L.jabin1007@xxxxxxxxxx) > [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: _Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) To unsubscribe from this group, send an email to _bob@xxxxxxxxxxxxxx (mailto:bob@xxxxxxxxxxxxx) or go to _http://autos.groups.yahoo.com/group/Chrysler300/join_ (http://autos.groups.yahoo.com/group/Chrysler300/join) and select the "Leave Group" button For list server instructions, go to _http://www.chrysler300club.com/yahoolist/inst.htm_ (http://www.chrysler300club.com/yahoolist/inst.htm) For archives go to _http://www.forwardlook.net/300-archive/search.htm#querylangYahoo_ (http://www.forwardlook.net/300-archive/search.htm#querylangYahoo) ! 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