Alright so I have been looking around for a bit and the other day my muffler piped just broke . Oh well welded it temporarily (it was so rusted as we tried to clean it up more stuff just kept falling off) and I am now looking to get a new system.

As of now I was thinking RB header & silencer to this Y pipe and mufflers. Oh and I am going to keep the cats from the stock exaughst and make a test pipe for when I need my next inspection lol


I was wondering if that would be a good setup for an 87 NA GXL. I don't want uber loud but I also don't want something that runs and looks like something that came out of a chalostamy bag.

Thanks for any input

 

On an N/A the RB system will work just fine and probably will even produce some additional power over the stock system. About the uber loud part though....a catback system is definately going to be LOUD.

 

I just did a Magnaflow Downpipe, which replaces the 2 precats. Magnaflow high flow main cat and then a Dynamax catback. Much louder than my stock clogged crap, but it really sounds nice i think when you step on it. Did it all for $400.00. The Cat has the air tube so your ports still work, and you wont smell like a mechanic everytime you drive it. I have a Rotary Warehouse Race Port, so it seemed to really open up the engine.

 

Can you elaborate on this? I had planned to replace my cats with a new straight pipe and send the piping all the way back to some new performance mufflers. Is there something i should do (i.e, make a hole and attach this 'air tube' to my downpipe?) not super familiar with this car and its exhaust yet. Please explain what i should do as we arent buying aftermarket pipes we are fabricating it ourselves. Thanks

p.s the dirt heavy fuel smell is there for me as well, i attributed it to clogged up cats. is this correct?

Regards
Zip

 

I would also like to hear an elaboration.

Also you wouldn't by any chance have any links for those would you?

 

The system you linked to is the biggest POS I've ever used. I HAD to use that system for 2 months and wouldn't recommend it to anyone. Not too mention it's Pacesetter which is generally know for poor quality.

 

Unless you wire open your ports, which is a bad idea, you'll need some sort of way to activate them. The test pipe probably doesnt have the air tube to do this, and even if it did, you likely wouldn't have enough backpressure to operate them.
Running a high flow cat gives you the ability to pass general emissions, operating 5th and 6th ports, and yes, gets rid of that foul fuel smell. I had the same problem, and along with some idle adjustments, this took care of it.

 

I am running a RB Header to a Bonez Cat to two Rotary Performance MUfflers.

Good system. A little loud still, you might want to replace the bonez cat with a Borla XR-1. I'm sure that would quite it down a bit.

Check out RP's site: www.rx-7.com

Cheers,
Cody

 

I plan on removing both cats completely, we have no emissions laws in quebec. Can i do this and have downpipe straight to both mufflers, can i still 'operate the 5th and 6ths ports'? without cats? really i have not much of an idea how this works why ports open i thought there werent valves, opening and closing ports sounds like a valve. im so confused guys, can i remove my cats and put straight pipe???

 

Do a header and a greddy muffler, 2.5" put a presilencer in it if you think it's too loud, but i love it.

 

why does everybody make a bid deal about opening up the 5th and 6th ports? its not that big of a difference! mine werent working and i pulled them out. Waayyy more top end since they werent activating, with a little.... SLIGHT less torque, barely noticable. just put on a straight pipe wire your 5th a 6th ports open with these (in the link) in them.

http://www.pineappleracing.com/index...PROD&ProdID=11

 

you rock thank you,

So i basically jam those into my downpipe?

 

oh im reading to install those sleves i have to remove the lower intake manifold, my garage wont do that for me, and i dont trust myself, Could i wire the stock 6th port actuators to a switch on the gas pedal or something? dang just wanna open up my exhaust :-P

 

I don't care what he says there is a large difference in low end power with the aux ports wired open. My car was very sluggish down low with them wired open and I couldn't even break the tires loose in first gear when turning when normally it was no problem doing that.
The correct way is to get the RB presilencer (along with their downpipe or header). It has the tube that connects to the split air pipe to operate them correctly. If you are cheap and won't do that then you can activate them with an air pump and a rpm switch. I am currently doing a full writeup on how to do this, but you can find other info by searching.

 

no no no... th ose go into the sleeves in your 5th and 6th ports. they arent valves in any way. your engine has 6 intake ports. 4 of them are always open sucking in air, and 2 (the 5th and 6th ports) stay closed until you hit about 3800 rmps, them open to create more airflow/gas into the engine, thus more power. You dont jam those into your downpipe, you have to take off your whole intake and get down to the intake ports. Take out the 2 sleves and install them in there, they create better air flow. Its not nessesary or anything, just better. If you get a straight pipe system just wire open your 5th and 6th ports. OR if you want them to work, you will have to have to have a pipe coming out of the downpipe up to your actuators. There are numerous threads on this if you use the search buttom up top you can find alot more info.

 

Thanks for bearing with me guys,

Ya maybe im cheap, but basically I dont want to pay for someones fabricatinon when i can just bend some pipe make a flange and do it myself.

I currently have almost NO TORQUE in low rpms, the car is balless until mid-high range.

Could my ports be stuck open?

Would i benefit from just closing them somehow?

how do i check to see what they are doing.

I just learned that theese ports existed today while reading your replies.

Cheers Zip

 

Well, rotaries don't produce much torque to begin with, certainly not low end torque. The power is more on the mid - high end.

Cheers,
Cody

 

True that we dont have any emission tests but we have laws. Removing the cats and replacing them with a pipe could get you in trouble during a visual inspection. I'm removing mine anyways but it's a risk you should be aware of.

As for checking the ports, just put some grease on the actuator linkage and rev the engine to redline. Then simply check if the grease has moved.

 

RB Eater , as you are removing your cats what are you planning on doing to open your 6ths ports?

As well are you neer montreal, I would like to meet some RX enthusiasts, maybe goto the jewlep on thursdays.

Cheers
Zip