89gtufc3s

Hey guys, Ive got an s5, and im searching for a good cat-back system for my seven. I know most people here agree on the racing beat, but has anyone had experience with the dual Apexi N1? I havnt been able to find which would have a better hp gain, and Ive also heard the RB is really quiet. The only other mods done is a new intake since ive only had the car a couple months. Does anyone have advice on the way to go?

Modified 7

turbo or n/a?

Well my freind has the n1 duals on his 87 base and it sounds pretty nice and deep

89gtufc3s

Mine is na. Do you know if it produces more ower than the RB?

89gtufc3s

More power*

Wankel7

True Duals - Racing beat

I got a vid of a friends car driving away....

PM with your email and I will send it to you!

James

89gtufc3s

ok

89gtufc3s

Alright, but the question at hand is WHAT WILL MAKE ME GO FASTER

fcrx88

a turbo haha. i had the racingbeat duals on my old gxl they werent to loud but not to quiet. i went from an open header that i ran for 2 months to those so i could barely tell the car was on though.

sectachrome

borla or RB. a catback isnt really gonna do much for ya anyway. mostly looks/sound.

89gtufc3s

oh

89gtufc3s

So what sould be done first, headers, cat, or cat-back?

Modified 7

ok it depends what route u want to take... If you want "More Power" as you say then a header (racing beat) and any cat-back will really do...i have an rb header with rb mufflers and its loud as hell. But when i put the header on i noticed a big difference in power...so if i was you i would by the header and exhaust package from racingbeat.com <it gives u more power

89gtufc3s

Thanx alot, ill get right on it. Ive also heard after a new exhaust system is installed, the ecu should get reset or something like that. Ive been doing alot of work on my own car, but ive never once wanted to deal with the car's computer. Is it really neccesary?

Modified 7

well my ecu is screwed up on my car so i cant really tell you. But on my old car i got a custom exhuast on it and my ecu was fine (car computer) so it shouldn't be a problem

sweet86

a racing beat header & N1 exhaust should do the trick. It'll give you some extra power and will attract alot of attention.(Other Imports will hear you comin)

89gtufc3s

The
rb heeader and the n1's is what I was planning. Also, my friend replaced his cat with a strait pipe, because we dont have emissions testing in kansas, but his headback shoots out thick black smoke. Although its a good power gain, it was the ugliest thing ive ever seen. Should i just stick with getting a high flow cat?

NorCal90

Highflow cat or race pipe (no cat) it doesn't make much difference in flow. Race pipes are cheaper so thats why I would go that route. Your friend's black smoke is not a result of having no cat. Its because of a tuning problem I believe. Hopefully someone here will help you out a little more and know enough to be specific. All I know is that not having a cat will not make your car shoot thick black smoke, only flames .

Hot_Dog

I currently have the HKS 50mm Sport on my 90 GXL, and am favorably impressed with its tone and lifetime. I installed the HKS in May 1999, and there's hardly any rust on the pipes and mufflers. I believe the pipes and mufflers are aluminized steel. However, the flanges seem to be slowly rusting away. BTW, I live in Virginia, so we see snow occasionally. On the downside, the HKS is fairly pricey at about $850.

Prior to the HKS exhaust, I had the Borla SS exhaust on my GXL for nearly 25K miles. I replaced the Borla because it was too noisey. At highway speeds, there was always a continuous loud droaning sound in the cockpit. On long road trips the noise became very annoying, and that's why I decided to replace the Borla with the HKS. I still have the Borla exhaust, but the y-pipe is slightly bent. It's for sale, so if you're interested just PM me.

Prior to the Borla, I was running the stock exhaust. The thing with the stock exhaust is that its lifetime seems to be almost exactly 4 years. I once had an 1986 RX7 Sport (BTW, my first RX7), and when the exhaust went out in 1990 (4-years later) I decided to trade it in for my current 90 GXL. Four years later (in 1994), the exhaust needed replacing so I went with the stock replacement. Another 4 years passed, and the stock exhaust needed replacing again so I decided to try the Borla SS system. After all, it did come with a million mile warranty. ;-)

Hot_Dog
90 RX7 GXL
02 Acura RSX-S

Rex7Vert

Hey Hot_Dog, with your exhaust experience, maybe you can help me out. My sister gave me her ’88 RX7 convertible just prior to Christmas (she and her husband weren’t using it and it was deteriorating) and I’ve been slowly fixing it up. I replaced the cat with a universal one because it was leaking and earlier this week I had the mufflers replaced with a couple of Dynomax pieces. The owner at the local muffler shop said he had these mufflers in his inventory for quite some time and would sell them to me at cost. I had them put on, and the car is so LOUD now! It has a deep bass tone that I find really annoying --- especially under load or deceleration. I went back today and he took off one of the preconverters, which was shot anyway, and replaced it with a muffler. It made little improvement. He said to drive the car for a couple of weeks and it should quiet down when the insides of all the new components “carbon up” (I really don’t think so). I want the exhaust as quiet as possible. My other car is a Lexus SC400 and it has such a nice, subtle exhaust note.

Any ideas (anyone?)

Thanks,

George

Hot_Dog

I've got the Bonez Superflo converter/presilencer combo from Rotary Performance (www.rx7.com) on my GXL along with the HKS 50mm Sport exhaust system, and my car is reasonably quiet but with a good exhaust tone. I had a Mindtrain Highflow converter on my car prior to the Bonez Superflo converter. The Mindtrain didn't have a presilencer. The SS packed presilencer on the Bonez Superflo made a noticeable difference in exhaust noise. The Greedy cat back is claimed to be the quietest exhaust available for the RX7, but it cost big $$$. The HKS Sport is also a fairly quite exhaust, but it's not cheap either. Rex7Vert, as a first step, I'd recommend installling the Bonez Superflow converter/presilencer or Bonez Duel Cat System on car. If that doesn't make quiet enough for you, than I'd suggest looking at a different exhaust system. You may want to give Rotary Performance a call, and ask them for advice.

Hot_Dog
90 RX7 GXL
02 Acura RSX-S

Rex7Vert

Thanks for the tips, Hot_Dog. I'm gonna start doing some more research based on the info you gave me. Some of the mufflers are said to give a low, sporty or baritone note, which is what I'm trying to get away from. That's what I have now with the new mufflers. Just wish I hadn't already spent $500.00 for the mufflers and cat (and it sounds much worse than the original, partially rusted out stock system!) Oh well --- live and learn!

George

driftseshrx7

i have rb header, test pipe, apexi n1 turbo cat back which has premuffler and resinator before muffler and it sounds beautifull, has a surprisingly deep tone

Rex7Vert

Thanks for the reply driftseshrx7. I've been doing some checking around and it looks like the quietest system is still stock, or close to stock. I think Walker makes OEM equivalents. I'm going to look into those. I believe Dynomax and Walker are both divisions of Tenneco Automotive. I have the Dynomax mufflers now, but I think that must be more of a performance division. I'm sure if I had gone with the stock replacement it would have been just fine. By the way, anyone know the best site for OEM Mazda parts? I ordered a few things from Vachon Mazda and they seem pretty good, but I'm sure there are plenty of others ...

Thanks,

George

1987RX7guy

iTrader: (3)

Do not buy N1's. Spend your money on mufflers that work.

driftseshrx7

ah well mazdatrix.com is pretty good for parts. O i love n1s, im ok with being a little loud but with the stock pre muffler and resinator it sounds pretty nice imo