I use 2.5" on all my HP engines. I also put a set of the expensive Dynomax mufflers on my 63 and I hate them. You can't hear yourself think untill you hit around 55mph and up. Gary Barker Owen & Jo Grigg wrote: >Hi all >My 300C "driver" is due for a new exhaust system, I was considering going to a 2.25" system from front to back rather than stepping down to 2" tailpipes as original. Would be interested in what others have done? Also what mufflers to use to get the most out of the 300C without getting a drone thru the car or a headache after five minutes drive. I see Flowmaster are doing a 3 chamber muffler, has anyone used these? I guess what I'm trying to do is get the hemi to breathe a bit better/less restrictive but keep as close to original in style/look. >I note that Flowmaster recommend the following, which suggests that the standard system is restrictive? > > >a.. What pipe size should I use for a street application? >In general, the following guidelines should be followed for street applications. > 2" tubing up to 100 hp per pipe > 2.25" tubing up to 160 hp per pipe > 2.5" tubing up to 200 hp per pipe > 3" tubing up to 300 hp per pipe > > > Thanks. >b.. Owen >c.. Auckland,NZ > > > > >[Non-text portions of this message have been removed] > > > > >To send a message to this group, send an email to: >Chrysler300@xxxxxxxxxxxxxxx > >For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm >Yahoo! Groups Links > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Yahoo! Autos. Everything you need to know about buying or selling a car. FREE Quotes, 360° Tours, Research, Blue Book, Compare Vehicles, Buy Used http://us.click.yahoo.com/kEZsdA/bwnGAA/YiGOAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> 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/