My exhaust setup is basically a down pipe and the stock cat... then the RB exhaust. I was wondering if I can make this more quiet. Is there a way???
what about a resonated midpipe? Will that make it
more quiet????? or a performance cat????
I like quiet exhausts but the stock one seriously
look like ****!~!!!!~~~~

But I love me BR Duals!!~~~ way to go~~~

 

The stock cat is quieter than the high-flow cat and resonated midpipe that I have by a lot. Perhaps there is some large muffler that could be used in the midpipe to be quieter than the stock cat, but most muffled midpipes are likely to be louder than the stock cat.

-Max

 

The RX7Store resonated midpipe works great at taming these noisy beasts. Mine works great with the RB dual and GT53/40 turbo.

 

any midpipe is gonna be louder than the stock cat though guys, come on now... the RB is just about as quiet as it gets... if you want quieter, you're only option (that i can thinik of at least) is to put a stock cat-back back on in.

 

What you want the car to sound like a Honda Goldwing??

Put the precat back on and/or weld another mufler into the exhaust system. Of course it kind of defeats the purpose of the RB cat-back.

 

There are some exceptions, but for the most part, quieter = less power. You have to make a choice. I didn't want a loud exhaust either, so I went with what you have: DP, stock main cat, and RB dual tip CB. I have been very happy with it. I am considering getting a high flow cat, but am concerned about it being too loud for what I want.

 

midpipe....straight through exhaust....let that thing rip

8,000 rpm with a street port....ahhhhhhh....so good....how these engines love to rev, while destroying ricers

just wear ear plugs as you enjoy a cacophony from the "lawn mower on crack"....I wear ear plugs all the time, in the car, on the bike, waverunner, mowing the lawn, whatever....it's a noisy world, protect your hearing, but get out there and kick ***

and turn up that Iron Maiden "Somewhere in Time"....no ear plugs allowed for that masterpiece

 

Back in 1997 I was trying to quiet my car further (non-sequential is hard on the neighbors) even after adding the RB twin tip (my fourth exhaust in the first six or seven months).

While talking to Brian Richards (Mostly Mazda/M2), he said that they ran Borla XR-1 mufflers in series on their race cars to knock down noise for track regulations without significantly impeding exhaust flow. Borla claims (or did at that time) an 8 dB reduction in noise with tests showing an insignificant reduction in power.

I slapped a 12" oval XR-1 into my midpipe shortly after and was greatly pleased with the reduction in noise, while it didn't seem to have any ill effects on power.

Granted that all cars/engines are not necessarily created equal, but with the RB twin tip, Borla XR-1/midpipe, and a Tri-Point downpipe and all other mods identical including boost, my car was faster than Jim/Trev Dagley's CYM R1 which had a hollowed-pre-cat, standard midpipe, and HKS single tip cat-back. I could easily overtake Trev at speeds up to 150-160 mph. Then again, my car was a Wednesday car to begin with, apparently.

 

Wow~~~ Thanks for all these reply's~~~
so...the Borla XR-1 is a muffler that you can place where your cat goes???? or is it somekind of resonated midpipe?? I'm getting interested in this.......
Anyone has this setup????
Thanks

 

Removing the cat will not make your car quieter. It is the main component that is removing noise in your system.

 

Hmmm...anyone in the same situation ever welded a XR-1 in the DP?? Just a thought.

If I'm not mistaken the Tri-point DP had some sort of a muffler thing on it...never could justify the expensive price tag though. Maybe Jim can verify this.

 

If you think the RB is loud, you must have an exhaust leak. It is seriously barely louder than stock, with the windows up anyway. It doesn't drone on the highway either. I certainly didn't want a loud car either, but even with the RB on, the car sounds like a "cuisinart on steroids" in just cruising around mode. I can't understand how anyone would want a quieter exhaust than the RB -- and this is coming from an acoustical engineer.....

 

get an HKS carbon-ti........... those are really quiet!

j/k... i think the racing beat is a quiet as your going to get after the stock catback!

 

Really??
RB is the Quietest???? hmmm..... I remember when I used to have hondas... Greddy was really quiet and it was sweet!!~~~ I like to hear the turbo's spooling rather than hear the exhaust!~~~~
Turbo Spool sound is the ultimate high for me~~~
shhhhhhwwwweeeeeeeee~~~~phhhhhssssT!!!!(Blow off)
Plus I don't have an exhaust leak.....maybe its because of my race ported motor...... because on idle it sounds like serious ****!!!!!!!! bla bla bla bla bla.....it sounds like the motor is going to shut off....but it doesn't....kekekeke....
But....man it pulls hard after 5000 rpms....wooo hoo~~~

 

Maybe doing that would make it look like a pre-cat but heat coating should help some with the noise.

That is their Hi-Flow Pre-Cat and not their DP.

 

No room.

Nope, it was just one of the earliest options for a mandrel-bent stainless downpipe. Tri-Point is equally "proud" of most of their components, though.

The picture below is of my first exhaust combination; the Tri-Point stainless downpipe, a Tri-Point stainless midpipe, and an ASP Racing stainless cat back. Stock P.O.S. on the right.



Borla XR-1 Sportsman Race muffler (I used PN 157-40943)...
http://www.jegs.com/cgi-bin/ncommerc...68&prmenbr=361

 

Off-throttle, anyway.

When I dyno'd my car the first time, I had the Tri-Point downpipe, Tri-Point midpipe with Borla XR-1, and the stock cat-back on the car (I was waiting on the RB and had sold my PFS single tip already). When I cracked it open, the rest of the club members quickly backed out of the bay with their hands over their ears. When I was finished with the run, the only guy left in the bay was the dyno operator, and he had a set of Peltor shooting ear muffs on.

Even with a stock cat-back and a Borla XR-1, non-sequential with a ported exhaust manifold is louder than hell at WOT. The RB twin tip didn't do anything to change that, but you're right, it eliminated the droning at highway speed and the backfiring and fire *****, which were the things I hated most about the PFS single tip. That and the "smoot" on the back of the car. The RB twin tip doesn't smoot as bad.

You must still have both cats and you're definitely still sequential.

 

This this thread a JOKE?

The RB dual tip is the quietest out there. I have a RB dual tip, stock cat and DP. It is very quiet.

I have sampled the PFS single tip, HKS dual tip, Greddy single tip, RB single tip, straight pipe, and a couple other unknown (to me) brands.

There won't be anything quieter than the RB dual. If your car is loud you have another problem.

 

Well, I can't speak for sequential cars, but if all you have in the way of exhaust is the RB twin tip and you're wide open and non-sequential, it is not all that quiet at anything but idle. While I do agree that it's probably the quietest cat-back out there, my car was still loud even with the Borla XR-1 added.

In fact, driving out to Trev Dagley's dad's place in Maple Valley, if there was no traffic I'd rip up to 150-160 after taking the left turn onto the 2-mile straight before the access road/test track to their house and they could hear me get on it from the turn, over 2 miles away, echoing up and down the valley.

 

My setup is the same as his. It is NOT loud.

seq or non-seq is not mentioned. Non-seq without a stock cat must the be the worst turbo setup in the world. Boost arrives at 4000rpm?

 

Did you mean to say with a stock cat?

Properly converted (gates removed, plugged, exhaust manifold ported) without cats, non-sequential will make full boost (15+ psi) by or before 3,200 rpm in 1st gear. 1st gear goes by so quickly anyway with full mods that I don't know why anyone complains about lag or lack of low end power unless they've done the poor man's conversion and/or still have their cats.

 

Sell your car.

 

Jim, the fact is that this guy still has his main cat -- the only way he's going to make his exhaust quieter is to put the stock cat-back back on (assuming he's still seq).

 

BTW: I run non-seq with stock cat still in place, but turbo manifold not modified - basically poor man's.

Full boost is around 4krpm, but honestly, I don't have an issue with it. I'll convert it properly when I pull the turbos to be rebuilt (which is why I didn't pull the manifold originally).

 

I did mean to say with cat.

3200rpm vs. 1700-2100rpm is a huge difference IMHO, any turbo or auto manufacturer would agree. The reason I complain is because when I drive around I don't always have the car spinning at 3200rpm or HIGHER. It is annoying to hear the engine revving that high at a cruise and creates more heat and engine wear. So when I want to GO, I either have to shift down or wait. Well the FD isn't about waiting...

I drove a FD over the last few days the made 17psi or so down low, hard to tell exactly what rpm since it had 4.88 gears and accelerated like crazy but if I had to guess it was around 2500 rpm or so.

Non-seq is a hack, plain and simple. No one ever seems to prove it puts out more power, the only place it is "better" is on the track where it eliminates the spike at transition.

Back to the issue at hand, DP, Stock cat and RB dual noise level. It won't get any quieter unless he puts stock components back on it. That is the bottom line.