So im considering these brands for my exhaust upgrade unless i find better for the buck. RB rev T2 claims 59 dyno over stock on an s4 turbo and it 3" from the turbo to the y pipe. It then spits off to 60mm left and right mufflers.

The corksport power turbo back is 80mm all the way from turbo back. It costs less also. But how much power do you think it gets over stock? Could it be like the rb in power gain. CS has never dyno tested this product. Have you guys any exp with this?

 

good question i would like to know too. i would only want the rb exhaust for the more acceptable daily sound

 

Dual split mufflers are gay in my opinion. I'd go single. It will yield more power in theory. Realistically, both will probably yield about the same amount of power. Go with the one you like.

 

you are thinking about this in the wrong way.

 

The not as loud is why I'm looking into the rb also. The single pipe should be lighter. It's ss too.

I called cs and the dude said he thinks something like 20hp. One would think it would yeild to much more power considering that it's 80mm all the way down. Idk though. Like I said they've never dyno tested it. I'm not oposed to the louder tones if it's about the same considering the price. I hope someone can give us a good answer Lowjack7.

 

??????? What's the right trian of thought?

 

what RB doesnt tell you is that you need FCD and piggy-back ecu to compensate for the increased boost, with out it, youll just **** it your engine (if im not mistaken).

EDIT: without those extra parts, you wont get ~60hp out of it.

 

Actually they have an explicit warning about the FCD...
My vote is to go with the RB system. I just completed their NA system on my car and it's amazing.

 

^ so it seems they do, i still believe you need a piggy back ecu for some other manner..
my friend is running the knight sport, but maybe hes using it for the FCD. ill have to ask him.

 

Both will flow well, but the RB setup will be quieter and sound better IMHO.

The RB claim is due to the boost creep you'll get by bolting on a free-flowing exhaust without changing anything else. Add their FCD alone, and you'll just pop the engine. WG porting, bigger injectors, a better fuel pump and fuel control need to come first.

 

don't base those power output claims on the exhaust systems alone, the RB exhaust doesn't make 59 more horsepower without the additional boost creep that the car was seeing on the dyno... so it's a false claim. exhaust diameter is tuned to the needs of the engine, 3" is good for about 400-ish WHP before it starts to become a bottleneck but it can be forced up to about 600WHP.

the corksport will start to annoy you after a while though, adding additional muffling to the exhaust will put it closer to the same cost as the RB in the longrun, and not look as professionally made.

 

I had the RevII exhaust on the car,and tried a swap to the Corksport 3 inch Turbo setup..single can(3 inch in 4 inch out).
The single setup was obnoxiously loud,compared to the RB system with the presilencer.
It boils down to personal preference,weight,noise level,single or Dual..Cost too,if that matters.
I want the coupe to run single BUT I am not gonna drive the car with a Loud system.
I wanna shed weight off the system too,so Eventually I will find a single that has all those features..
maybe it won't be one of the two mentioned,BUT right now the Dual can RB system is still on the car,and sounds good enough to drive on the street without getting hassled.That is a good thing.I spend all my money ON the car,,not on Tickets!

 

Ya the CS is very loud. this is more or less what it will sound like

http://www.streetfire.net/video/rx7-idle_717157.htm

But im running a RB 3"dp, a CS 3" midpipe and the CS 3" exhaust. I like it, but i also like loud systems. put it this way its loud enough to vibrate my whole leg and make it tingle after. =). Besides that i love the CS system i got mine for a steal 170$ never used. i think it was that price.

 

Thanks for the info. I'm not sure wich one I'll choose. My car is loud as hell already. I've got some stupid welded set up that still has a cat and ends at twin magnaflow cans. They look like 3". I can't hear my music playing when I'm on the freeway sometimes. I'm kinda used to the loud sounds. Did the little silencer cat not help with the cs exhaust?

Karak and rocket88. You dudes are fountains of rotary knowledge. I suspected rb might be using boost creep as an added power gain. My car ran hard on the stupid set up I have now on creep of 10psi. This is with a blown rear apex seal too. I've ported my turbo waste gate now and I'll be using Rtek 1.7 till I upgrade to stand alone. I have a supra pump waiting to be put in also.

 

I dislike the Corksport.
THe sound annoys the hell out of me on the highway. Though I do love it when you are gunning it, but it is really annoying when you drive regularly.

I have RB setups on all my Rx7 except my 88Se from 4 years ago, that had a custom exhaust that I loved to death, true dual setups with RB header, presilencer, and dynomax ultra mufflers.

On my Turbo, I have the REV TII and it is so much better then the Corksport if its your daily driver and the local authorities wont have you on their radar. The only bad side to all of RB setups is that the system weights a lot, buts its all high quality stainless steel.

If you already have a Rtek 1.7, they come with FCD built in. Since its a 1.7 that means you must be running 720cc secondary injectors. 12 psi is relatively safe with a ported wastegate and an upgraded fuel pump.

 

^ I dont have the Rtek yet. Im going to do it though. The weight is something im thinking about. Im sure any dual ended exhaust is heavy. it would be nice to shed a little.

Any ideas on liter set ups? What single pipe set ups are others running? I found HKS silent hi-power but its piping is smaller. Not by much but still and it costs about as much as the Rev T2.

 

While we are on the subject of exhaust. What happens when you delete the cat and the the air pump, ecv, egr, valves? Will the car run in limp mode? Rtek 1.7 wont help that will it.

 

ya id spend the extra $$ and get the 2.1 thats what i have in my car. and im not even close to modded out yet.

 

i wouldn't say false claim, if we went back to 1986 with a CS exhaust and put it on the car that RB used to dyno their system, you know it would creep too. it would probably dyno about the same #.

its not false to change the RB unit for stock and the car picks up 60hp. true some of that is because of the higher boost, but it still happens

 

do any of you guys have experience with apexi gt spec exhaust? Know the inlet diameters? I called apex about it but they seem to have missmatch info on them right now. ?

 

I have to put my apexi gt spec exhaust on my new 10ae this week, ill try to remember to get diameters on everything for you while its swapped

 

Oh ya. Please do!

 

Since both are removing most of the restriction, which is a fixed amount, they are likely to give about the same benefit. Or at the very least it's impossible to do more than a few HP above RB (i.e., removing 100% of the restriction) and even then it'd take extreme measures. 95% of this is in the mufflers/cat or presilencer anyway, not the pipe so pipe size won't do much. The main difference in quality is keeping the sound in control. RB tends to not be too loud, dunno about corksport.

So IMO pick exhausts based on sound preference since HP is probably similar.

 

I have the RB REV TII, and I absolutely love it. I have lots of mods and have yet to have my car on the dyno. Late May my car will be tuned. So, as for performance... I have nothing to say, yet! If you're looking for a great sounding exhaust that isn't too loud and looks great, then the REV TII is the exhaust to go with. This is my personal opinion, of course.

 

Sure. I guess it is a lot of personal preferance. youtube has some good vids on rb. CS doesnt sound that good. I think i liked one out of 5 clips that i saw. I like the sound of apexi n1 and gt spec. But they are so expensive for a catback alone.