I just recently put on a header with a home made 2-1/2 madrel bent exhaust. Right now I'm running a 4" round 14"body magnaflow muffler/resonator as a precilencer immediatly after the header and then a magnaflow 2-1/2 inlet dual 2.25 outlet muffler.

Its WAY too loud!

(I've made the precilencer removable so I can replace it with a cat for emissions and the cat is just as loud)

Here's the stuff I'm currently running:
Muffler: http://www.magnaflow.com/02product/s...ne=main&id=631
Resonator: http://www.magnaflow.com/02product/s...ne=main&id=498

On my old car (same year & model) I had the stock manifold, 2.25" all the way back with a generic cat & magnaflow 2.25 in, dual 2" out and it sounded very nice. Not loud at all with a nice deep tone.


The header gave me alot more power (can get break it loose grabbing 2nd gear now), but I want a quieter exhaust. I don't mind if its loud at WOT, but when I'm cruising I'd like it to be quiter as I have a long freeway commute where I cruise at 4000rpm and right now it sucks. Also a deeper tone all around would be nice -- I hate the buzzing sound it has now.



I know the problem is mostly to do with the header, so here are my thoughts:

1) Make a new flange for the header with dual pipes that will feed into basically the same magnaflow muffler I have now, except in reverse. then go back to my current muffler. I'll still have my resonator so I can add that inbetween if needed.
Here's the muffler I would use for this: http://www.magnaflow.com/02product/s...ne=main&id=848
(I chose the 5x11 oval over the 5x8 because I think it will be quieter.)

2) simply add another resonator. Either the same one or are there other options?

3) I've also read about a lot of people using borla mufflers with good success. Would a borla work best as a presilencer & my current muffler? or as the main muffler with my current 4" resonator?


Also, would header wrap quiet it down at all?
(I think I'm gonna put some on anyway as the headers get bright orange when they're hot and have melted my idler arm bushing)



(oh, and before anyone says it... I WILL NOT consider racing beat.)



anyone have some experience in this?




I'm leaning towards option #1 right now since I think it will help to 'merge' the sound of the 2 rotors into one nicer tone the best since it will be happening in the muffler rather than before.

 

anyone?

I know this has been covered a lot, but I've never heard of anyone using a dual in sigle out muffler as the collector for their header before

 

RB Header > RB Presilencer > 2 inch > Borla Turbo Muffler

Sounds awesome at idle and low RPM, gets louder at WOT, but still not harsh.

Whoops, didn't see the no-RB thing.

Go custom then with the header, and try a Dynomax Bullet race muffler after the header as a silencer, then 2 inch into the borla muffler. That's what I'm planning on doing, because RB stuff is too much $$$.

 

Probably what boohame said. Borla is a awesome company with a low tone

 

Plus you can get them pretty cheap on Ebay.

This thread is an awesome thread about exhaust setups with nice tones:

https://www.rx7club.com/showthread.p...erence+muffler

 

this is true, but by the time u try all the different combinations of setups, u'd spent enough to have bought a rb setup.

 

That's where research comes in. I've heard every combination that's worth a damn, and seen info on how well all of them hold up and flow etc, so there won't be any trying. Just get the stuff I know works and it's done.

RB header, RB presilencer, Dynomax bullet and or Magnaflow resenator, to a borla turbo muffler will run about 400-450 dollars complete, compared to a RB at 870+shipping.

 

damn, i hadn't realized that system had gotten so expensive. a friend sold me the streetport system off his wrecked SE for $100 when i built my engine and put it in my 808. now it's one my fb i have yet to start driving. post a vid somewhere, i'm currious as to how it sounds.

 

You need more mufflers upstream.

 

I've found that the RB silencer is literally worth its weight in gold. The thing does amazing work in improving the tone and smoothness of the exhaust note. If nothing else, one of their silencers should find a place in your exhaust system. That said, they don't really quiet the exhaust much, at least the mini presilecer doesn't, which is what I have. (It came with my RB header.) Anyhoo, my setup is the RB short primary header -> RB mini presilencer -> Magnapack bottle resonator -> Borla Turbo center in/offset out.

In your case, I'd ditch the Magnaflow main muffler and try a Borla instead. They're simply better mufflers in both tone and noise reduction. I had the same muffler that you did and if you look inside, a big chunk of the duals isn't even muffled. The perforations in the core stop a good 2-3 inches before the pipes exit the case. That can't be good for sound reduction... The Borla, on the other hand, has perforations right up to the edge of the case. It's also lighter and smaller than the Magnaflow. I'd also chuck another Magnaflow bottle muffler in the mix as well.

You could probably get away with just adding another Magnaflow bottle, but the tone and smoothness of the Borla VS the Magnaflow is enough to justify getting one, IMHO. Only the RB main muffler bests the nice deep tone that I get from my Borla.

Hope this helps.

 

so does your exhaust look something like this, past the racing beat presilencer

 

Yep, though mine isn't nearly as straight. Also the Magnaflow I have is the stainless finish and is a good deal shiner.

Kinda funny considering how ratty the rest of my car looks. :p

 

thanks for the good info. I read you other thread about the borla exh... Do you think the borla would work alright as a precilencer?

I would like to keep my magnaflow muffler as I like the stock look of dual tips and I couldn't find any borla's like that

alterntely, how well do the rb silencers flow, and more importantly do they cut down on the raspy tone common with headers at all?

 

If you're concerned about flow, get a 2nd gen presilencer. They've got a bigger ID than the 12A ones. (2.5 vs 2 inches, IIRC) As for sound, the RB presilencer almost entirely eliminates the rasp from a header. Like I said above, the difference is striking.

As for using a Borla as a silencer, sure you could use it that way. I wouldn't though. If you're attached to your rear Magnaflow, keep it and add the RB silencer to the mix. I don't think it will sound as good, but that's just one man's opinion.

 

thanks again.

I think I'll try to find an RB pre-silencer.

Would it matter if I run it before or after my current magnaflow resonator? I hate doing exhaust and I've got a chunk of stright pipe after it that could eaily be cut out and replaced with the RB.

 

Ern, I use RB headers, RB presilencer and a quality (expensive) rear muffler from a company I don't remember, I'll check but it sounds great for a stock port. With the Mikuni induction noise its nice and crisp.

 

ITS LOUD!

For how much you told me you spent on your muffler, I would've thought it would've been quieter.

Then again, somehow Pete has the "quiet" car among us all.