Looking at RockAuto there are 2 different mufflers available for the dual exhaust system...the "Quiet Flow" and the "Sound FX" models. What is the difference? Do both have the hangers welded on as they are advertised as stock replacements?

Anyone know off the top of their head the size of the bolts at the cat/h-pipe flanges?

Also, on a NPI motor CVLX is it really even worth it to step up to the dual exhaust? I mean, there are MANY higher performing/HP cars that have single exhaust systems.

I went with a junk yard PI system on my single exhaust 95 LX. It made a differance in better gas mileage and I picked up a few ponies. Still way to quite for me.

Cool




http://info.rockauto.com/Walker/Detail.html?128-673.jpg
So the Sound FX is more or less a Dynomax muffler welded up for direct fit. If those were available in 2006 I would have gotten those instead of the quiet flows.

So the SoundFX is basically a "turbo II" style muffler and it looks like the Quiet Flow model is the only one with the hangers welded on and of course the SoundFX model is what I would be wanting...

I just emailed RockAuto to see if they can tell me if the SoundFX mufflers have the hangers on them.

Since I have gone to the extent of doing the PI swap (as well as many other things) on the '98 Stang and the CV is my DD I won't bother doing the PI swap on it. Is it still worth doing the dual exhaust swap?

Good idea, in 2006 they listed a Dynomax option but had a notation Modificaion required etc..

It LOOKS like a direct fit but worth finding out for sure.

Can't find a decription for the part#

http://www.walkerexhaust.com/products/mufflers_soundfx.asp

This does show that they are making direct fit sound FX for certian applications. They should have no problem making a Crown Vic version since they have the jigs etc for the quiet flow version.

I went ahead and emailed Walker the same question...covering all my bases.

According to RockAuto the SoundFX muffs have the factory style hangers welded in place.

Kewall! I wonder how they sound since they aren't of "flowmaster" type. In my experience on various other V8 cars I've found flowmaster type mufflers to be quite free flowing and good sounding but louder and quieter at different points in the RPM range which I didn't like as much. The turbo type is a little quieter but much more consistent in sound throughout RPM.

Am I off base?

Nope, that has been my experience. I have the Flowmaster American Thunder cat-back with a cat-less h-pipe on the Mustang and it is loud. My CJ5 with the 304 V8 has dual Turbo II mufflers and it is nice and mellow but you can hear it.

Does anyone have the part numbers for the 2 hanger brackets and the corresponding bolts for the drivers side. I will need those and a local junk yard does not have them.

*EDIT* Disregard that question....I remembered the exhaust parts list in the P71 section.

I can save almost $25 in shipping if I have RockAuto send the order to my business address.

Here is an oddball question...will all the pieces fit in the trunk of the CV so I can get them home???

you can fit all that stuff PLUS a stroller and a bunch of guns. don't ask me how i know...

Yeah all that stuff fits in the Vic, I have my parts shipped to work too.

And big ++ on getting the hangers new, they are cheap and come with the new rubber hangers. I did not save much$$ pulling it out of a P-71 on my back. The bolts were a pia to get at with the bent pipes in the way.

So if you order this stuff from Rockauto you can bolt all this in yourself? A better question would be is all this "slip fit" and not in need of welding?