I got these from mazdatrix, they'll be installed soon.

EXHAUST HEADER 13B 86-92 RX7 NON-TURBO 16130 $187.00
EXH CONVERTER REPLACES 16405 MZ1927-23055 $450.00
MUFFLER PAIR+"Y"PIPE 86-92 50MM RB 16420 $576.00

That's the header to single hi flow cat to Y-pipe and RB catback.

I decided not to go true dual because buying two cats would be very expensive, and I don't want catless exhaust.

Anyone have this setup? What do you think about it? On an otherwise bone stock car w/ a strong motor, who can guess (or who has dynoed and can tell) what kind of HP gain they noticed?

Also, would a cone filter/cold air box help all that much?

I can't wait till it's on the car

 

wait, who exactly is the manufacturer of this header I purchased

http://www.mazdatrix.com/e-gray.htm

Someone else on here has to have this thing and the rb catback

 

Racingbeat make it I think. you should have gone true duals man I have them and I love them. just switch back to stock stuff if you need to pass emmisions.

 

It seems that many states will pass these combos of headers and converter, but we can NOT sell them as "emissions legal" -- you are on your own for passing tests and legality


with this stuff you might not even pass emmisions testing. you should have jsut gone for the duals dude

 

How much horse power is gain from going to duals all the wal back as compared to a RB Header and RB PreSliencer with high flow muffler?

 

I thought about it a lot, believe me. There isn't sniff testing here in Champaign, IL. Maybe in a few years it will come here, but the whole urban area only has 100,000 or so people here, and 20 minutes in any direction and it really is the middle of nowhere. By the time it gets here, if it ever does, I'll probably have moved somewhere. A lot of the locals would probably be really pissed off if emissions testing came here. There's the portion of the town that works for the university, and there's the much larger portion of total rednecks who like nascar

The deciding factor was that my car was probably going to backfire and make a really smelly exhaust without a cat of any sort. I really do care about smelly exhaust and carbon monoxide. Also, I could still get a ticket for not having a cat on, even though there's no sniff test. And the ticket is very large. The other thing was that in the event that the car was broken in some way in the future, no car shop would touch it since it didn't have a cat. I do not have a garage or tools, or even a level driveway

Even though I'll miss out on a lot of HP, and the true dual setup was cheaper(!), I think I made the right choice. Also, woodsy owl would be really pissed at me if I didn't have a catalytic converter.

Plus, when I go to visit my folks up north in Chicago area, the cops WILL be on the listen for really obnoxious catless exhaust sounds, and I'd surely be busted

 

I have been driving the car already for abouta week and no cop has even looked at me funny in the least bit. But then again every other honda has an exhaust louder than mine so I don't know. I don't think that shops would not touch your car because of that dude. if they are rotary guys then I don't think they will be like damn better not touch that. Hell proly most of them don't have emmisions stuff either. The exhaust does not smell that much. You have to stand behind the car for a while to even tell that it does not have a cat. The exhaust is not loud if you are just cruising or idling the car. You could also just have said the precilencers are cats the cop won't know the difference.

 

How much horse power is gain from going to duals all the wal back as compared to a RB Header and RB PreSliencer with high flow muffler?


proly like 10 more hp I guess. Please do not wuote me on that it is only speculation.

 

ha well you've only had it a week, and there's a world of difference I'm sure between Laredo, TX and Champaign, IL.

Also, there are no rotary shops here. The one place that works on "import" cars wouldn't touch my rex. ("I won't work on those") I do not live in fast and the furious-ville. I had the employee driving me home from the mazda and 50 other brands dealer say he thought all mazdas had the rotary engine, and then didn't even know what one was

Besides that, any place that does at least exhaust work (possibly any work?) on a catless car can get a very large ticket, at least in Illinois. I'm still trying to find out if my car would pass emissions w/the header and hi flow cat in this state, if we did have emissions. At http://www.epa.state.il.us/air/vim/g..._elements.html it says:

"Installing a replacement part that is not the same in design and function as the part that was originally on the vehicle, such as an incorrect exhaust part. "

Whoopsie. At least I wouldn't get a ticket on the road. But it also says "Adding a part that was not originally certified on the vehicle, such as installing a turbocharger. " which sucks. I wonder if that means they'd fail you if you bought an NA but put TII stuff in there.

As far as catless exhuast with a presilencer, maybe a cop wouldn't know the difference, but I used to work for the police here and I know a few at least were gearheads

 

there's a world of difference I'm sure between Laredo, TX and Champaign, IL.

true

mazda and 50 other brands dealer say he thought all mazdas had the rotary engine, and then didn't even know what one was

never ever go to the dealer or an "import shop" unless they specificaly work on Rotary cars that is a big no-no.

there should be a shop near you some where. have you tried the regional sections? Ask them and you might find a shop close to you. I know a lot of guys that have taken off the cats from there vehicles and have had their cars like that for many years and nothing was said to them but the inspectors or the cops. One is my own father just so you know. Maybe you should move to Laredo where I live and you can get the duals haha. It is a lot warmer here.

 

Good idea, maybe I'll try regionals section. Maybe I should move to laredo. Save my car from rusting any more.

Anyway, so does anyone else have the setup I have? It's described above. What are your thoughts on it?

 

I have had 4 setups in the past 2 years.

1) Stock manifold through straight pipes to bombs. – LOUD - a little power gain.

2) Header to straight pipes to bombs. – WAY too LOUD! – some power gain.

3) Header to single 3” silencer to bombs. – nice tone – nice power gain.

4) Header to dual silencers to bombs. Nice stereo tone – nice power gain with a little more low end.

Click on the link in my sig to hear idle tone with a throttle blip.

 

that is a lot of exhausts dude. Have you ever put your car on a dyno? that soundclip is cool. mine sounds better though IMO

 

I sort of evolved it as I had cash in my pocket. What's in it now cost about $300/

 

damn!

nothing compared to my cost. Oh well