header, single pre-silencer, "Y" pipe, and RB mufflers.

or...

Presilencer, straightpipe, and RB mufflers.

They're kinda similar. Those 2 cost about the same. Which one would you get? Which one would make more power, and which one would be louder?

thanks

 

Mazdatrix true duel.... If I had a N/A

 

but true dual cost $1200! way too much for me.

 

Since you are looking at a header, I will assume NA. I spent quite a bit of time on the phone with both RB & Mazdatrix last week, and ended up ordering the full dual exhaust from Mazdatrix for a '91 NA.

This is what they both told me:

With equivalent mufflers, any system with a header would be louder under heavy throttle than one with the stock manifold. Both the collected and race header will produce significantly more power potential than ANY system running the stock manifold.

Despite what I have read on the forum, they both said DB levels were very similar between the collected header and the dual (race) header, when equipped with the RB mufflers. There is a large power differential in favor of the uncollected system.

Either would be reasonably quiet at idle or moderate throttle with the RB mufflers. Both will get noisy when you put your foot in it.

In essence their info came down to this. If you are looking for quiet operation, keep the stock manifold. If you want HP, replace it all.

My system shipped Thursday, and will be installed next weekend. Replacing a complete stock exhaust. Will report back on sound levels after installation.

 

Hmm I think I'll go headers then.
I just hope it's not too loud.
I'll probably pick it up from them directly, since they are pretty close by.

oh yea, I have an 89 GXL, sorry I forgot to mention it.

thanks

 

If you are going there, you can probably listen to them before you buy. The fellow I spoke to at Mazdatrix said he had been running the full dual on his car for several years.

 

I would go with RB, but that's because I am not fond of Mazdatrix.

 

Go with true-dual. You don't have to buy their $1200 kit . Just buy their $200 header, any 2 mufflers you want and have a shop weld it altogether. I know that would be loud but you can install the silencers at the same time or put some in later on down the road.

 

Is true dual that much better than single?

 

It is better, but I'm not positive on how much better. Thats just the route I would go, and actually was going with my old NA(still have the dual-outlet header). If you want your NA to be as fast as it can be then go true-dual. If you want your NA to be quicker than it is, just get the regular one.

 

No, a well-designed collected single will outperform an uncollected dual (aka "true dual" in slang) system. However, single exhausts are LOUD on a non-turbo car unless you have pre-silencers, cats, and/or pre-cats.

Which one would I get? I don't know, as that depends on a lot of things. I have an RB "Street Port" exhaust system on my 1Gen, and it is extremely quiet (maybe too quiet) but still makes excellent power. Just stay away from glasspacks and Flowmaster mufflers. It looks like you have narrowed it down to some good choices.

 

the truth is this ... if you plan on running stock ports for as long as you have the car, then the "true dual" will not make THAT much of a difference ... it'll run a little harder upstairs, but how often are you "constantly" above 6000 RPM on the highway???

if, however, you plan to streetport (or bridge or something weird like that) then the true dual system will make a difference. again, it will be in the upper part of the powerband, but it will be A LOT more noticeable than on a stock port engine.

about the mufflers ... be VERY careful! if noise is an issue for you, believe me ... i don't work for RB and they don't pay me to endorse their stuff, but i've never heard a muffler sound as quiet on a rotary as that one (and very FEW mufflers can match the quality in sound). even with the presilencers in place, other mufflers will be loud.

the other issue with mufflers is make sure you find one that is packed with steel, not FIBERGLASS, or some other material that will melt!

 

thanks for the advice!
I plan to get a street port, but my engine has to pop first. Hopefully in a long time!
I know that RB is quiet, but is it that quiet?!
I hope that it's at least louder than stock!

 

i don't know if i would necessarily say that it is LOUDER than stock, but it definitely has a much lower pitch and depending on where you are (like if you're in a place that promotes sound wave travel) you will notice that it can be heard more than stock (from idle all the way up) ... but the reward is more in the quality of sound, than the volume.

 

Before the "true dual" crowd gets out of hand with their delusions of grandeur, I would like to point out that every car in the front row of this picture has a collected SINGLE exhaust. I'm not saying that the "true dual" is bad, but just that the most advanced rotary race cars have single exhausts, so there is probably something to this.

 

Damn where is that pic from evil?

 

ok, I have the mods on my sig and my car is too loud! I wanted to change the mufflers. Will RB makes my car sounds closer to stock? If it does, then I'll go with RB because my car right now sounds 10x louder than it was before

 

2001 MADS. It was absolutely the best, er, car show?, that I have ever been to. OK, so I'm a little bit rotary-biased.
http://www.mscw.com/photos.html

 

Thanks guys.
I think I'll get the 2nd one. The reason is that I'm a little short on money. :P

that pic sure is cool! my new wallpaper!

 

I've done both setups on NA's and frankly the header was way louder at WOT as well as cruising range. I could tell that the downpipe system created a little more backpressure which made city driving easier. It was also more bearable on the ears. DB levels are amazing on the header back system.

MY 2 cents.

Rishie

 

I took my stock mufflers off and put the RB N/A mufflers on (stock Y-pipe) and it is MUCH quieter. The RB mufflers do a much better job of quieting then the OEMs. Yours will probably be louder because it has the header. Mine is just about as quiet as it was with the full stock system but now it has much better flow.