smnc

MY question is this: Which exaust system should I go with?

I need a header, cat and muffler.

There's the Mazdatrix system with a header and a cat, and RacingBeat makes a complete system with a pre-silencer.

Couple questions: Are either of the headers bolt up replacements for the stock downpipe? (i.e., could I still bolt the stock cats on to them?)
Secondly, can I still pass emissions with a pre-silencer instead of a cat?

Pittdp

I would go with Mazdatrix just because I know that they make the mufler just for the heat of the Rx-7, and the pipes are direct bolt on.

P.O.S. Racing

Pittdp, Wouldn’t it be the same situation for the Racing Beat Setup?

BadAssRX-7

from what i know the r.b and m.t exh stuff is the same stuff....r.b.

P.O.S. Racing

Doesn’t look like RB offers cats. Darn, I can’t get over the $$$$ for my –SE it’s $620.00 for the hi pro sys without the connecting pipe. Or I can spend $667.00 for the street port system! Keep in; mind you don’t get a connecting pipe for that price!

I put a Gibson Cat back system with 3” pipe, muffler, and SS Tip on my Ford Expedition for under $300.00! Looks like there may be some serious profit-taking going on!

Hopefully Mazdatrix has better prices than RB, what’s Mazdatrix $$'s?

GT1

look at the pics of the mazdatrix headers in their catalogue and you can see the RB cutout on the flange.

P.O.S. Racing

What’s Mazdatrix $$'s?

rotorhead

rx7s have a REALLY hot exhaust. standard pipes just wont cut it. they'll usually rust or burn out prematurely. pipes made for the rx *should* be more expensive... and should be thicker and made from stainless! not sure what the rb's are made of, but i'm guessing its a little tougher than your expedition's exh. everything i see leads me to believe the maztrix and rb pipes are the same. i think rb makes them, maztrix resells rb pipes. lots of maztrix stuff is like that... take a look at the strut tower brace(firewall attach). it says racing beat on it! go with the cheaper of the 2, they're the same thing.

P.O.S. Racing

Racing Beats catalog specifies that they, “use high quality thick-wall mild steel tubing in our exhaust components, with the exception of the stainless steel perforated core, and stainless steel wool in all of our Power Pulse Presilencers.” The problem with stainless steel is it’s dimensional stability, when it gets hot it grows, plus it tends to hold the heat.

They also specify a rotary’s exhaust can be between 1,700 to 2,000 deg. F at full throttle and high RPM as compared to 1,100 to 1,400 deg F for a four stroke reciprocating engine. What are the temperatures at lower RPMs and without your foot firmly planted to the floor? The rotary does pump out hotter exhaust, but keep in mind the OEM pipes are cold roll steel. So it must be the mufflers and Presilencers that need the extra beef. I don’t deny that fact. It also makes me wonder what Racing Beats definition of thick-wall mild steel tubing is vs. what may be considered a conventional muffler shop mild steel tube. Could your local muffler shop make the pipes, and then you just add the RB muffler. Would have to imagine that could save ya a couple of bucks.

Figure your correct rotorhead, my Ford 4.9 liter V8 would have cooler exhaust, but it does move more exhaust gasses than a RX7. Have noted the 3” tubing has reduced backpressure on the system, which has increased the gas mileage and lowered its normal operating temperature, especially when towing. Which would lowers the exhaust gas temperatures. So wouldn’t similar benefits be obtained by upping the diameter of the exhaust tubing on an RX7? (Just a thought)

Still think the $$$ seems a bit high…don’t you?

Pittdp

You may be right about the Muffler but I am looking at the system as a whole and RB does not list all the items needed.

riffraff

i just installed my new racing beat exhaust today... bolted up fine once i tore out the exhaust manifold, air pump, and the rest of that useless crapp. only problem with it is that it does not have cats. so i am not street legal here, (not as if i was before though)...

stinkfist

Mazdatrix does not make exhaust systems. All of their exhaust is Racing Beat. The prices from Mazdatrix are exactly the same as RB. That being said, I buy all of my RB stuff from Mazdatrix. The reason is I have delt with both, and RB customer service leaves a lot to be desired. Mazdatrix is always more than helpful. So I tend to support the company that seems to want my buisness. I am, however, Still supporting RB by buying their product. I usually won't buy RB if someone else makes the same product of equal or better quality. Some things you just can't get from anywhere else though and they make very good products.
I personally have the RB road race exhaust on my 84 gsl. I like this exhaust a lot and think it is top quality, BUT, I would not buy it again. There are a few reasons.
It is sooooo heavy. I think if I had to do it over again I would either go with a mindtrain header rb presilenser and rb muffler. Or I would get a Yaw power header and the rest of the exhaust the same as above. Both of these systems are two into one. I know everyone says that the best thing for a rotary is duals but Both the Yaw and MT header dyno more HP than the RB. I work on a race team. We race 2 1st gens in both EP and IT-7 and run 2 into one exhaust on both of our cars. Both of our cars are front runners and the EP car is first in points in the SE region. Most of the 7's at the track run 2 into one headers. The only down side to the exhaust I'm talking about building is that it would not be bolt in. you would have to weld some pipe and flanges. Nothing an exhaust shop couldn't do with ease. Shouldn't cost much either.

Good luck,
Mike

jimmyv13

You will not pass emissions tests with that exhaust. Check my sig , I have the same exhaust and I failed my test in New York miserably.

Did you get the dual alt pulley, yet?

RC51DRAG

When you installed the RB exhaust did you require the gasket kit they suggest. Also did you go with the dual exhaust. Finally what rejetting if any did you require? thanks

peejay

I think some Mazdatrix stuff is their own, like the 2nd-gen dual system. Anything with a 16xxx part number or similar is RB.

RB pipes are .125" wall thickness. That is 1/8", DAMN thick for exhaust pipe. Imagine using chainlink fence rail tubing as an exhaust system! For reference standard tubing is usually .030-.060 or so thick.

Jeff20B

iTrader: (13)

Mazdatrix makes their own version of the GSL-SE "streetport" dual exhaust with the sensing tube bung on the header so the secondary actuators will open sooner than the Racing Beat version with the bung on one of the presilencers.

Dyre

The higher price is probably simple economics of scale....

How many Ford trucks are out there?
compare that to running 1st gens...

Being a specialty shop means your not going for the mass market... so you should expect higher prices for this kind of stuff.

That said, my friend recently bought the full header/dual presilencer/mufler system for his first gen and was amazed at the quality.... That system will still be there when nothing is left of the car but rust and plastic.

joemkr

i have to agree with dvre on the quality of the rb street port system.
i bet i can run it over with my ford e-250 van and not crush the presilencers.
it is extra heavy duty.