i found some SSautochrome single exhaust today on ebay and was thinking about getting that , i kinda like the way single looks but i also like to look stock with the RB turbo back, i can almost buy them both for the same price each. so what would you guys choose, old school RB turbo back or this
http://cgi.ebay.com/ebaymotors/RX7-F...98841299QQrdZ1

 

I have the SS autochrome. It fits great but it's really loud. I'm actually looking for a RB.

 

The single has greater performance value (being lighter, flow characteristics between the two are unknown to me, though). Therefore I'd go with the single, because I don't really care how an exhaust looks, just that it will provide the best performance. I recently switched to a single myself...

 

igotta little vid clip if anyone wants to hose it for me- i have the ssautochrome as well, a little loud but i like it

 

I'll host it, email it to me ddub114@comcast.net

 

the rb has great results but im going with the ssautochrome myself i like the single alot more not only that but its alot lighter what ever u go with make sure u have the fuel cut eliminator or fuel will cut out to the back rotor do to increased boost from the exhaust

 

Split pipe into duals has a greater potential for higher flow with lower noise. Mufflers basically work by being a restriction to exhaust flow. Fluids follow laws very similar to electronics (wiring parallel resistors).
Take one muffler and you get a restriction. Take two of the same muffler, put them in parallel, and you get a higher drop in noise and less restriction than the single.

Less noise, more flow.... happy eardrums, plenty of power. Now, just to solve the extra weight problem.

 

I always thought the SSAUTOCHROME exhaust outflowed the RB...not by alot but by a little...first off its truly 3 1/8in from the Turboback correct...the RB Turboback starts out at 3in and after the y-pipe turns into 2.5 or 2.75....correct me if im wrong...not trying to start an argument or anything like that...but i do have the SS Turboback exhaust and i love it...its loud but not annoying in my opinion and on WOT...it screams GET OUTTA MY DAMN WAY....and by the way it causes the turbo to spool up very quickly...i learned that the hard way...LOL...but its all good now...if you get that exhaust...please have all the reliability mods to go along with it...
Mike

 

If this is a daily driver, get the RB. The noise will get on your nerves after a while.

 

Can't say which flows more without taking some measurements and doing some quick calculations.

I merely stated what the laws of physics dictate. Two equal mufflers plumbed in parallel will flow more and create less noise than the same muffler plumbed as a single.
Unless, of course, you used VERY tiny piping...

 

I figured on most FC turbo applications, the 3 1/8" turboback piping (if you get CS full turbo back rather than the SS autocrap knockoff) would be enough flow.

I realize split dual pipes do have a greater potential, but will people take advantage of that potential enough to matter?

The weight thing is harder. Maybe if RB exhaust components were not so freaking heavy, overly heavy, it'd be better. But unfortunately RB has very heavy exhaust when it comes to most companies. You could make a custom dual catback with ceramic coated aluminum piping, though, and that'd be nice and light. Of course you could do that with a single as well

 

SSAC turboback single with a 3"X16" Borla XR1 behind the mid resonator and i think it sounds perfect. total cost $380, however i cut and welded in the Borla myself.

 

Did you cut it off where the SSAC system tapered down to 2.5"? I never understand why people never notice this, but I'm sure you did.

The SSAC system in that ebay auction linked above is just like the others, which tapers down to 2.5". I don't see how this is helpful for someone looking for a 3" full system, which they advertise, when clearly it's not.

 

On most stock FC applications, 3 1/8" is plenty. Around 400 hp, I like 4" piping.

I'm arguing against the flow of either design in question. I am saying that you can get more flow and less noise by simply using two mufflers in parallel. Every thread I have seen people try to reduce noise by putting more mufflers inline. This reduces exhaust flow and reduces noise. Why not just switch back to a parallel set-up? Less noise AND better flow.

Now then... the other fancy thing about parallel setup is that the heat energy gets divided between pipes... so you can reduce the pipe wall thickness on a parallel setup compared to a single to help with the weight savings.
Really, though, I don't care about an extra 20 lbs. at the rear tires. The measurable effect on acceleration is nill.

Alec, I'll take "Equal flow with less ear damage" for $100, please.

 

See, this is exactly my point. To get the noise down, more restriction was introduced. Had another SSAC muffler been placed in line, you would have gotten much less noise with MORE flow.

 

quit bein cheap.....get the Apex'i N1!!!!! you can't beat it with a stick!

 

I love my SS auto chrome exhaust. the only thing that sucks is that it tapers to 2.5 and then back to 3, but you can't beat the price. I got mine for 345 shipped, most cat backs cost more then that. The sond isn't that bad at all either, I like the sound, I don't even have a radio I just listen to the exhuast.