I need to quiet this thing down before the neighbors throw a fit! Am running a half bridge port, downpipe, magnaflow resonated mid pipe, and a Pettit (I think it is the same as a RB) single tip.

Right now I just want to replace the mid pipe. Would like to stay with 3" but don't care if is a hi-flow cat or a resonated mid pipe (or both if that would make a difference).

So what is the most quiet option out there?

Thanks for any suggestions,

Jeff

 

put a cat back on it.

 

I'd say a stock catback would make the biggest difference in sound. Should also give you a bit of low end torque as well.

 

its got a bridge i dont think bridge ported FD with a 3in exhaust and quiet can go into the same sentence ever. but i would try a high flow cat and a resonated mid pipe with a cat back and a silencer.

 

You probably already have the quietest setup, with a bridge you cant really restrict it, pretty much all you can do to quiet it down is to get rid of the bridge due to the higher idle range...

 

Thanks for the replies. Are any certain brands of the hi-flow cats quieter than the others? Are you all saying that a hi-flow cat is more quiet than a resonated mid-pipe such as this magnaflow?

 

try go for those full hks systems, costly but it might shut it up abit, not too sure though. you cant really make your bridge quiet. even with a 2.5 system although it sounds abit more gentle.

 

i dont remember any HKS exhaust being quite
RB is your best bet, GReddy is next
you can always make a custom one

 

Yes, a hi-flo cat will be quieter than a midpipe with a single resonator. You have a few options:

* have 2 resonators welded into the midpipe
* go with a hi-flow cat (Bonez or Magnaflow)

along with that:

* go with a silencer for the catback

I'm not sure of the tip size for the Pettit single tip catback, but here are some options:

http://www.apexi-usa.com/products/?id=5327

http://www.supertrapp.com/


Lastly, to quiet the car, you are going to have to basically plug up the flow. I'm not sure why you got a bridge port if sound was going to be an issue.

 

Greddy SP hands down, it is quieter than the RB, doesnt look as good but hey you gotta do what you gotta do. I run this on my streetported, nonsequential(no sequential manifold flapper door) with borla resonated midpipe and 3"dpipe, the car is extremely extremely quiet. If I am in my garage and the exhaust pipe is not pointed directly at the garage I cant hear the car idleing if it is more than 20-25 feet away from the garage. That is at a 1k-1100 rpm idle.

 

Here's a test someone did a test with different mufflers on a Mustang on a chassis dyno.

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).






I personally have the Borla XS
i am happy with it

 

If you have a magnaflow res MP with the large rectangular canister, it's not going to get any better short of installing a factory oem main cat (at least wrt the center section).

Re: the catback---Apex'i GT Spec or N1 single with Apex'i Active Tailpipe Silencer.

/thread.

 

are you seriously saying that the large magnaflow canister on the rx7store midpipe is more noisy than a high flow cat? I just bought this midpipe along with a rb dual tip hoping to get the quietest sound possible...

 

Yes. I had a buddy years ago who ran DP, midpipe with a Magnaflow resonator and a Racing Beat dual tip catback. He was louder than my DP, Bonez hi-flo with a Greddy Power Extreme catback. However, he definitely had less restriction with his resonator verses my hi-flo cat.

 

Yes, I don't doubt that it is but compared to what?

It's relative until you put another car next to it to do some comparisons. My buddy thought his was pretty quiet (especially from his prior setup). However when next to mine, it was louder. We did several highway pulls and his car was definitely louder (with a slightly larger intake port as well).

 

Unfortunately, I don't remember which one. This was about 4-5 years ago, so it's possible they have better ones today. I'm not saying the Magnaflow is not quiet, it's just relative. The OP apparently already has a Magnoflow resonator, but he's looking for something quieter.

 

I just recently switched from a magnaflow resonated midpipe(canister style) to a magnaflow 3" cat and it did quiet it down a little. Not a ton but it was noticeable, that was on a streetport and 35r. I would say to get a big difference you will need one of those exhaust butteryfly valves or the apex active silencer.

 

Thanks everyone for the replies so far. Kind of sounds like whatever gains in noise levels will be minimal (may just need to idle out of the neighborhood whenever everyone is mowing their lawns). As far as the getting the HBP, that was in the car when I bought it, although it was non-running at that time. I'll admit up front, I don't know a lot about these cars yet but thanks to all of you I am learning. Still haven't driven it yet, am trying to set the PFC up. Eventually I would like to replace the HBP with a stock or mild street port but for now this is what it is.

I am leaning towards the hi-flo, if it is quieter that would be great but I'm also tired of smelling like exhaust whenever I start the car and fiddle with it.

I'll look into the silencers also. Thanks for the ideas.

Jeff

 

http://videos.streetfire.net/video/N...-Sp_709781.htm

This is my personal car with 3"Ebay DP, Borla Resonated MP, Greddy SP, Street Port, Real Non-sequential. There may be quieter setups out there but I havent found one yet, half of what you hear with my car is an exhaust leak between the Dp/MP.

 

Just keep adding more mufflers/resonators until it's quiet enough for you. Keep the one in there and add another between it and the Petite muffler. Go with a large canister if possible.

The crickets are louder then your car djseven lol

I'm running a straight 3" exhaust with KYO catback, it's pretty quiet at idle for just one muffler and no cats, it has a pretty large canister. I think with a resonated midpipe added it would be extremely quiet. It's quieter (and flows better) then my old stock exhaust with 2 1/2 midpipe and an N1 muffler, at least until I go into boost and my dump tube starts screaming.

 

I hate loud cars, yet I love rotaries It doesnt make sense I know. My car has a near stripped interior(seats back) and I wanted something extremely quiet. I cringe when I have to fire up a customers car with the N1 duals, old school PFS exhaust, or Blitz Nurspec exhausts. There are others that are loud but these are ones that stick out in my mind.

 

I don't mind if it's loud getting on it, but highway cruising and idle is terrible in loud cars.

 

Funny, I've always felt cars with high flow cats were louder than cars with magnaflow resonated MPs.

Keep in mind to run the Apex'i ATS silencer, you need one of the Apex'i exhausts. Funny how that works out

Cuddlebear, stop being a sissy.......next Deal's Gap Rotary Rally I want you to ride shotgun in my R1 at least once through the Dragon

 

how about the smb midpipe with metallic high flow cat and a resonator? this is what I run but on a full 3.5" system

 

That has been my experience as well. On my car with the Racing Beat cat back and 3" downpipe I have tried the following exhaust combos.

Stock cat quieted things down the most.
Followed by the mid pipe with a Maganflow similar to what RX7 store sells.
I also have the Bonez high flow cat which was similar in sound levels to the Magnaflow but not as pleasant.

I currently run the SMB cat + muffler combo and like it a lot from a sound quality, craftsmanship, quality of materials and performance. It is similar is sound levels (perhaps a little quieter) than the Magnaflow mufflered mid pipe yet has the metal cat so it decreases the nasty stench of the exhaust.