Well I went down to the muffler shop today to check on the progress of my exhaust sytem. I am just having the cherry bombs welded on right now so nothing to take a pic of but this is what I am creating. The coolest true dual ever.

I am gonna try to find a RB true dual headers. And agian I am to cheap to buy one new so if anybody has one used let me know. Anyways it will all start with the header. This will run two pipes back the 2 seperate cherry bombs(right now your going WTH). These will be used as my presilencers. I have used them before without them blowing out. And they will be removable so I can run no presilensers at autoX. Now for the back have and the most expensive part. Under the axle pipes running into 2 count them passenger side out let Apexi N1 mufflers. Angled slighly out and up. Oh and this will fit with some slight trimming of the rear bumper and a couple of other things. All of which I will take pics of when I get it all together. BTW I am still needing 2 Apexi N! mufflers. Anyone got one for cheap. And ill just buy the other new.

If you are thinking OMG its gonna sound like crap. Well it really dosnt at all. I have used it before a while back and it is the best sounding exhaust for under $500. Why $500 you ask that is kinda high. The pipe I am using is 3in stainless steel. So no problems with rust. When I get it all ready to put on the car I will take as many pics as possible. Also a video clip. Trust me it will not disapoint.

I really like the removable cherrybombs. Adds alittle bit of adjustment for the track.

So what do you guys think. Probably to ricer right. Maybe but it gets the job done.

Alex Saunders

 

3inch is too big for starters.

 

i have a RB dual outlet header for a 12a for sale. i paid 140+shipping, and i will sell it for the same

 

Have really thats what I always run. Hmm ok well damn I should probably call down there and tell them to change it. Thanks BTW. I am still thinking big block chevy and rx7 turbo here.

Alex Saunders

 

send me a pm I may be able to send out a money order after I get paid tomorrow if I dont find another one.

Alex Saunders

 

The temp from the engine will eventually and fastly do a melt down and crack to fiber insul in there. I would recomend a steel mesh packing style cherrybomb. It's simislar to what they had in the olden days and you can still buy them from summit racing or jegs. Just my 2

 

yeah you can get them at the shop I am getting it done at. The fiberglass ones or w/e they are made of i knew wouldnt hold up. So i got the ones that look like a big brilo pad inside. I was thinking of running 2 purple hornies. But hey its just a purple cherrybomb i am pretty sure.

Thanks.

Alex Saunders

 

Got alot of views for such a short thread life. I think everyone was expecting pictures.

 

why not just go with an exhaust cut-out/ dump pipes or something? Or bolt up something simple like a rb full exhaust? Why does it have to be so extravagant? It would be unique though..

 

Well I never did like te quietness of the RB. I like to standout a little. I have 2 of like 10 Rx7s in west Virginia. And half that number dont run. Plus I always gotta look better than the other FB in west virginia. Yeah you know who I am talking about.

 

lol

yeah, the rb isn't ear shatteringly loud, but i don't want a lot of attention attracted to myself.

 

u got a long way to go with that car.. to match with this Wv 7. Anyways that exhaust sounds great, it is very unique. Are u doing this for the power or for the sound?

 

A little bit of both. I have this theory that my car with this setup could bust the old glass out of my old high school. A 10in sub cracked a couple of pieces from across the street.

As far as a power aspect its gonna be freeflowing enough to run any big power adder I plan to put on it.

Alex Saunders

 

I'd like to welcome you to the land of low exhaust velocity, enjoy your stay!

 

Dual 3" pipes?!
Thats extremely overkill and just bulky.I run a single mandrel bend 3" stainless exhaust for my ported S5 13B turbo and its more than adequate.
If your forking out $$ for stainless piping and expensive mufflers,why use $20 cherry bombs?Get some stainless presilencers that will actually hold up to a rotary.
The true dual does sound nice,there is a RB system for 2nd gens that utilizes a true dual setup and it has a good tone.

 

I am glad to be here. I am now running a 2.25 pipe instead of a 3in. This should be a good size. Thank god I know the exhaust shop guy personally. I have been changing stuff all day on him.

The smaller pipe would incduce velocity. But I am having a hard time coming up with a compromize between free flow and velocity. I have been running all the math I know on the situation and cant come up with anything. Someone like to suggest a good pipe diamiter.

Thanks again

 

I dont like the RB system. I cant hear it. I cant hear alot of things. The car isnt going to be driven hard off the track if driven at all on the streets, I just want them there so if i go for a cruise it will quite them down a little bit. plus the guy making the system for me is doing it on a favor he owes me. I just have to supply the header and the 2 n1 mufflers.

I like it loud is that so bad. Itll be nice when it done. Have a little faith.

Alex Saunders

 

Dual 2.25" sounds more like it.You could even go dual 2.5" if your planning major,major porting or a supercharger on a 13B.
Unless you run a turbo,exhaust velocity and scavenging should be the deciding factor for pipe selection.You need some help getting the exhaust out,especially on a valveless rotary.
Turbo engines can go as big as possible on exhaust piping since backpressure is the enemy for us, and the exhaust ports are merged at the turbine anyways.

 

umm... I'll be the first to say it...



Why UNDER the axle? It makes sense for peripheral ported race motors and cars that get driven on the track ONLY, and get trailered everywhere.... but not on a street car.

 

Heres a question beside low ground clearence why not. I was thinking about going over it but then I had a though. I mean its heavier even by a little its still heavier. requires more bends and more material and welds. And if I lower my supension Then I have a chance even though it is small to crush the pipes with the axle. I did this once is a chevette, ya stupid car. ANd a stupid pothole. And a load of people in the back. Ok so itll never happen in the 7. But you never know.

I have seen other members of this section say they have run it this way so I said why not. If it fails it fails. I got a whole new exhaust system I could throw on anyways.

Thank you for your input guys

Alex Saunders

 

Ahhh now I am thinking again. The only other reason would be suspension travel, OMG how could I be that stupid. Must get FC out of my head. Back to the basics and a solid rear. BUT i would still like to know why some people on here run it under on there street cars then, I got the Idea from that and my GTU. Man I am contridicting myself this sucks at life.

Alex Saunders

 

i've been running mine under the axle. 3" turbo back mandrel bent, i made it myself. i did it because i wanted less bends and honestly it was easier. it doesnt hit anything or bind up on the rear sway bar. no problems at all due to it's location. WOOT. looks pretty beast too! hahahaha

 

not true i have run 3" hedder back to a 3" ford truck over axle pipe to a 3" inlet obxR muff sounds tite and tucks up nice same hight as diff you need a aftermarket hedder tho

 

Has anyone run the Moroso Spiral flow muflers as a pre-silencer? I run one on my supercharged honda and it works great at killing the high end sounds. Nice and open as well. Nothing to blow out.

 

Just because you can get it to physically bolt up doesn't mean it's the correct size. Do the terms scavenging and exhaust gas velocity mean anything to you?