So I found these old RX7 mufflers in my garage. The PO gave them to me when I bought the car but I forgot about them until now. He said they are louder, but not too loud. His complaint is that they resonated thru the whole car when cruising. I tried searching google, etc but I couldn't find any info on these mufflers. He said their racing beat but their not. Does anybody know anything about these mufflers? How they sound, perform etc? Will they sound like a chainsaw on my mostly stock S4 NA?

They have a steel case with stainless insides, appear to be straight thru in design.







Here's what I got right now:



Whaddya think should I put them on?

 

They look like old Dynomax mufflers. The three chamber inside is usually a Dynomax thing, but why are the front flanges cut off?

 

Dynomax

No wonder he said they drone.

I am guessing when he got the mufflers changed out they cut them off right at the flange. I can get that welded up i'm not really worried about that. I'm just worried about how they'll sound. I still have a cat and a resonator so it shouldn't be too loud, but I could see the droning. Do you think a Borla XR-1 would be better maybe?

 

Borla XR-1 would be better maybe? yes thats what i would do, ya never know what your getting with some ones old mufflers , because they never sound the same.

 

yeah it's probably an old dynomax muffler. Here's a pic of their newer design:


Looks pretty similar ehh?

 

yeah, I'm pretty sure that those are old school dynomax mufflers (But they do suck) If you've never heard them.........they do drone and the sound isn't very clean. Raspy and once they heat up good, they do drone quite a bit. You looking for loud mufflers, quiet mufflers, or something thats a good comprimise between (Racing Beat)?

 

I disagree. I like the sound of the dynomax muffs. It's not super loud leaving you with a headache yet not too quiet either. It's a nice deep sounding muffler giving my sub competition at 2800 rpm.

 

IMO, it's a real crappy design.


-Ted

 

I'm looking for a quiet muffler but louder than stock. I can't even hear my engine at WOT as it is! That shouldn't be on a rotary!

 

i love my XR1 but if yours sounds ok as it is just save your money and leave it alone.

 

What about the Racing Beat cans? They sound pretty nice and aren't too loud if you have the thermal reactor intact (instead of being dumb and buying a header which makes it super loud... oops.)

 

yeah Racing beat is known for it's subtle but rich sound, and at WOT it suddenly sounds less tame, everything else is good for street driving and not drawing attention, or waking the neighbors. An RB setup made my friend's protege sound awesomely rich, almost had that Ferrari pitch IMO.

 

rx7fromcal. take that bra off the mustang. ick. lol, jk. anway id put the mufflers on. they shouldnt be tooo loud. im guessing the old owner was an old man whose use to hearing no exhuast in his land yaght lincon continental?

 

I don't agree with you. I have the RB dual header with a Magnaflow presilencer and stock mufflers. Not loud at all. I am suprised, it's almost a straight pipe situation yet it is very mello.

 

i got some rb duals on my TII, right now its only firing on the trailing plugs but it sounds really good. nice and deep. i cant really compair to anything becuase its all i've heard. Ive got a 3" downpipe, one cat(dunno if its special), and it looks like 2.5" dual rbs.

 

hey i've got a cat back exhaust for sale...dont mean to hyjack the thread but they sound awesome...im just selling my old catback cuz the lady bought me a new one and you know how that is...obligated to rock it.

its fairly quiet at idle but still sounds mean and when you get on it...well...the neighbors know

pm me if ur interested

 

louder the better! just put em on i reckon!

 

HAHAH Yes he was an older guy! He is a software programmer so I am guessing he likes things quiet! Alright I am gonna try putting these on, what the heck. Thanks for all the inputs guys!

 

the stock mufflers really keep the noise down, that is until they eventually blow up.