I had the same experience with Flowmasters on my L two years ago. Even using the big 3 chamber Delta flows with an X crossover AND resonators, it was too loud inside. The drone when lifting off the throttle was especially bad. I switched to OEM style mufflers and now it sounds acceptable. I couldn't really detect any loss in performance either. That said, if anyone wants to buy a slightly used (2 weeks) set of flowmasters for 2.5" pipes, I can offer mine cheap. Steve Galezowski 300L ----- Original Message ----- From: "Jack Farris" <jackfarris@xxxxxxxxxxxxx> To: "Owen & Jo Grigg" <ram300@xxxxxxxxxx>; <Chrysler300@xxxxxxxxxxxxxxx> Sent: Wednesday, June 23, 2004 10:59 PM Subject: Re: [Chrysler300] 300C/D mufflers About four years ago, after some mild modifications to the 383 cid engine in my '66 300, I had a 2.5" dual exhaust system installed with 3-chamber Delta Series Flowmasters. The 2.5" pipes ran all the way from the manifolds to the exhaust tips with no stepdown. It sounded great from the outside! The inside was another story. The droning was terrible. The muffler shop said I needed resonators--so I had them installed. Slight improvement, but still too much drone. I called Flowmaster for advice. They said a crossover (H-Pipe) should help. I had that installed. Slight improvement, but still too much drone. I changed out all the hangers to make sure that the system was totally isolated--no improvement. After a couple of months of frustration, I removed the Flowmasters and installed OEM-style Walker mufflers. The droning was gone. The car now sounds great. It has the deep big block burble that I was hoping for in the first place. Jack ------------------------------------------------------------------- > From: "Owen & Jo Grigg" <ram300@xxxxxxxxxx> > Date: Thu, 24 Jun 2004 11:38:47 +1200 > To: <Chrysler300@xxxxxxxxxxxxxxx> > Subject: [Chrysler300] 300C/D mufflers > > 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 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/