GReddy Japanese-spec Exhaust
 

I'm wondering if anyone has the GReddy Japanese-spec Racing Cat-Back? Or have ever seen or heard one on an FD? I'm thinking about getting one of these but haven't really heard much about it.

here is a pic. http://www.rx7.com/pics/fd-japan-spec.jpg

That's just a standard N1 style exhaust, it's nothing special. It's basically equivalent to the HKS Hiper or the Blitz NuR Spec ... and almost the Tanabe RM (shorter tip, slightly fatter muffler). The N1 design is the purest and best flowing design of legal exhausts, it's ideal for turbo cars. And GReddy is made of mild steel. I'm not sure how much that one costs, but when making your decision consider it equivalent to the HKS and Blitz.

OK, I just looked on the site and at $445 it's not bad. It says "stainless" construction, but I do think most GReddy pipes are coated mild steel, not that there's anything wrong with that b/c my brother has a GReddy on his 300ZX and I have a Tanabe RM which is coated mild steel, also. If they have it in stock then I'd say go for it! :D

Anyone else have any experience with this exhaust?????

Pics! Anyone?????

I have that exhaust. It is the trust evolution II system. I have that combined with the trust midpipe. Of course it is not a legal exhaust, it says right on the canister "for racing use only". I don't believe it is readily available anywhere, until now. My car, and the "Black Wind" FD in Turbo magazine are the only one's I've ever seen with it. The guy that had the car before me had connections from Japan and thats how he got his. If you go the j-spec greddy web page...trust-power.com you will see it on there as evolution 2. It looks and sounds awesome. Wont pass smog, just like RP says it was never intended for the US market. Right now I have all of my stock exhaust components on, smog test time. Then I'll be putting that exhaust back on. I'd say get it if you're eyeing it, but only if you feel like swapping exhaust for smog, or you state doesn't have smog. The FD in turbo magazine passed smog with a DP, high flow cat, and that exhaust, with a t-78 and an air pump, I don't know how, but that only makes me want to do it. They really know their stuff apparantly. They had a haltech with the stock ecu emissions controls. Over 400hp and 100% emissions legal w/ papers to prove it. Thats a dream. I'll get some pics for you guys when I get the evo II back on my FD.

Passing smog isn't hard. I do the work on my friends FD and at the last MIR race here in Maryland I ran a 12.21@ 113 with it. Stock motor and turbos... it's still running in sequential mode even. Has the air pump running with a Random Tech HF Cat, DP, and APEXi N1, Blitz FMIC, pulleys, and APEXi PFC running 12psi of boost. He wanted me to make his RX a 12 second street car that he'd never have to worry about going through emissions and driving on the street...
The only emissions part that is dissabled is the EGR because of the PFC but that's not necessary for passing smog since the car has been running before going through the testing anyway.

That TRUST/Greddy N1 looks just like an APEXi N1, except it uses the larger diameter piping all the way through, which is better IMHO. I heard it's just as loud as the N1 and you could probably use anyone's 115 mm silencer in that if you had too...

so go ahead and get it...:D

theman, can the A'pexi power fc be used and the car still passes emissions? do you have to run different maps? I'm just kinda scared because I want to get one but im scared of failing emissions. I don't know what the reg is in MD but its 220HC here in DE. Think I can get a car with a power fc, dp, hiflow cat, and the whole 9 to pass? Let me know of any details or suggestions.
Thanks man,
Kev

Kev,

I my car passed smog chemicaly but it failed the visual inspection because the PFC will not controll the check engine light on start-up. So if your check engine light has to work to pass in your state you have to get around that.

There was a thread on here a few weeks ago about a timer that was easily hidden that would controll the light.

Here is the link to the thread
 

Delaware doesn't care about the check engine light. Just has to pass NOx and HC at idle and 2000 rpm. Also visual on the cat. They tried to to a vacuum check on the tank, but couldn't find the charcoal canaster.

I have the Japanease Greddy TR Evolution exhaust which is really made to fit with the T88 turbo kit from Greddy. It features V band style clamps for easy removal and installation, a resonated midpipe, and a removable silencer similar to a APEXi N1 style exhaust, it even comes with a silencer removal tool.

That "black wind" car was in TX. Lets see if he could pass smog in CA. We have to put our cars on a dyno when we smog here.

Also consider the N1 or the HKS Hiper. HKS has the regulare hiper which looks like the GReddy racing exhaust. 3" mild steel piping.

They also have the new Ti CF Hiper which is a US market only exhaust. It is basically the same Hiper except the canister is covered with CF over the SS, Ti tip and 3" SS piping.

Could you post some pics please?

In my opinion, this is the best exhaust there is on the market. It flows, it's construted nicely, and it's CHEAP!
Not too many people know about this exhaust, and I kinda like it that way, then not everyone will have it.

This J-spec is just like the rest of GReddy exhaust, it's deep and mellow at idle and gets kinda loud at WOT. But it is nothing like Apexi' exhausts. I don't care what kinda car you have or what mods you have, efry car I've seen or owned with an Apexi(just a cat-back even) is sooo loud, they just have different construction I guess.

But it does look and sound very nice. And the reason because it's so cheap(I was skeptical), I asked Rotary Performance(rx7.com) and they said because it's essentially just a straight pipe with a shiny canister on the end, there's no emissions packing or silencing baffles.

Go with the GReddy Jspec, for only $450 and it's much, MUCH larger than 3" diameter like the HKS and Apexi N1 ....it's a steal!

RotaryKnight,
The emissions results were posted in the article. The legal limit for HC in TX is 220 and the limit for CO is 1.20. They must have done it on a dyno because the have results for High "speed" emissions, and low "speed" emissions. For the high speed it had 16HC and 0.00CO. At low speed it read 33HC and 0.00CO. Gets the gears turning huh? Thats with the T-78, 850cc primaries and secondaries, fmic, all the good stuff, a bonez high flow cat(it actually says in the article "The guts in this cat are of the type more often found cleaning up the toxic emissions from industrial smoke stacks"), downpipe, the greddy j-spec exhaust, a haltech e6k wired to the stock ecu to maintain emissions controls("Fuel management is actually overseen by two computers, the stock Mazda ECU and Haltech Fuel Management computer. The Haltech unit is normally used as a stand-alone ECU replacement. To keep this car street-legal, Rotary Performance linked the two together so the Haltech computer controls air/fuel ratios and ignition mapping while the RX7's ECU handles emissions monitoring duties", i know you guys probably know a lot of this stuff but I'm just quoting), and also from the magazine "Rotary Performance installed a remote air pump to direct air into strategic points along the exhaust passage. Air is now injected through the nozzles at the exhaust ports and through a special conduit that leads to the catalytc converter." Chris from RP also said in the article "The trick is to minimize emissions before they enter the cat. The tough part was finding a cat that could hold up to the heat, punishment, and exhaust flow that we were going to subject it to." I don't know the details of CA's emissions regulations. Would those numbers pass there? I'd love to have this done to my FD!

Exhaust
 

Hey Dr. Just drove my car with my new Greddy J spec cat back. It looks great on the car and sounds awsome. It has a much deeper sound than my old exhaust.

Very happy with the looks, sound, and how well it flows with the rest of my exhaust system.

Allan:)

get the RE dolphin-tail .....now thats j-spec!.....(and$$$$)

Somebody post a sound clip!