hey guys i'm debating on single or daul out... the single out is cheaper....and i heard some people say it sounds louder.....but...i like the dauls....i mean psuedo-duals...

i have edelbrock tes...wich took about half an hour to install...i previously removed all exhaust............

single or dual outlets...i cant make up my mind..
oh yeah ..i'm thinking about flowmaster

Rob

 

well, id go with the duals, but it pretty much depends the look you like. also depends on the true performance u want, a single in single out, or a two out on the left will flow better then dual exhaust on each side.

------------------
- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

id go with dual, fbodies just arnt right with single

------------------
Trent
---Car---
89 Firebird/305 L03 TBI A4/t-tops
Open Element Edelbrock Aircleaner w/ K&N air filter/Summit Chrome Valve Covers
Edelbrock TES headers 3" out/flowmaster American thunder 3" exaust/Catco cat
---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's/Pioneer 4way ts-a6985 6x9's
profile cl640 110x4

 

yeah .....i was kinda hoping you would say dual...i just needed a little shove..tward something......now i think that flowmaster has 2 numbers for our cars that have side or split exits..are these on each side of the car..pas and driv..

thanks

rob

 

dual outlet will flow the same if not better than single out or 2 on the left as long as the 2 out pipes are the same diameter as the in pipe. Flowmaster has single 3" in, dual 3" out, so does Random Tech. There was a post about the Random Tech a week or 2 ago. It was only $315.

------------------
-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

yeah i think i saw random tech in some camaro mag...on the "project car" with the tes....hmm......oh yeah..got my headers...the pass...wont fit ..i have to "modify" the heater box..but..thats nothing a hammer cant fix....

thanks

rob

 

Tas, I always thought that the single outlet would be better for performance, (its not like 2 outlets on 1 muffler will make a car that much slower anyway if at all) no matter what size of the outlets on a dual out muffler because the exhaust doesn't have to change its direction and be put through another outlet on the opposite side next to the 1 that is right across from the inlet. Why would the size of the inlets and outlets change that?? If u know I'd like to also, I wouldn't put a single muffler on my car because I don't like the way it looks, if there is some that can flow better or the same as a single that would be cool.

------------------
89 RS
STILL Looking For:
An 87 IROC-Z28 350 TPI
Yeah I have an RS, but I want an IROC-Z!!

 

think about it, if all the pipes are the same size then its just like a single in out muffler but a pipe on the other side for looks.

 

Doesn't the other pipe cause turbulence in there because the exhaust gets directed another way instead of just being straight through??

[This message has been edited by IROCZTWENTYGR8 (edited November 01, 2001).]

 

if the crosslow muffler has outlets that are smaller than the inlets then the exaust will have to go through both pipe. Some will go almost in a strait path and the other will make a U turn. If the outlet pipes are the same size then all the exaust and just go straight though. it will act like a striaght through muffler. The other pipe will be there just for looks. Some gas will go to make the U turn, but not as much gas as in the case were the outlet pipes were smaller.

 

You could get the single in/out, put in the position that you would put a crossflow muffler in, and use a turndown for a tip. If you tuck it up nicely, it won't even be noticable. Mufflex uses this design on some of their 4" systems.

 

I agree with the single in/out but 3" I brought it back and tucked it

cant even see it... sounds good
you can watch a video on my site and hear it

I've read many articles with very good results with true single 3" all the way back..I like mine and it wasn't too much $$ to make up.

------------------
Hecubus
Check out my site http://www.geocities.com/hecubus91
91-Z28 305 Tpi "G92" mods-- K$N/Foil/Cat Back 3" Flowmaster/3" High Flow Cat/B&M shifter/ Intrax Springs/ Kyb Shock's-Struts's/Poly Bushings/Hotchkis Strut Tower Brace/Nos Wet Plate System currently ~ 175-200hp shot/ 255lph Fuel Pump/ Holly Adj. Fuel Press. Regulator/Digital Fuel,Air-fuel, voltage & Oil Press Guage's/MSD 6al/ Blaster coil/ Optima,Yellow top batt./Pro-Built stage 3 700 R4/ACT 2400 stall converter/Trans-Go shift kit

"I spent all my money on race cars, beer, and Broads... The Rest I wasted"

 

I still don't get how the size of the outlets make the exhaust flow differently other than just flowing more because of the increase in diameter with them.

 

If the pipes were all the same size how much exaust would make that big U turn trip to get out? If the outlet pipes are smaller than the inlets then more gas would have to make the longer U turn trip because all the gas can't get out the smaller pipe at the same time

 

Tas's point is that of pressure and think of it as electricity and looking for the easiest path to ground. The exhaust flow is a volume of gas that is under pressure. It is going to look for the easiest way out and if the inlet pipe is 3" and both outlets are 3", the exhaust will just flow out of the easiest of the 3" outlets in high volume situations. Now take the other style of crossflow muffler that has a single 3" inlet and dual 2 1/2" outlets. At low exhuast volume it will be fine. But if the outlet pipes are less than the inlet pipe, when the volume of the exhaust gasses gets high, the outlet pipes of the muffler cannot each accomodate, by themselves, the volume of exhaust flow that is coming into the muffler since the inlet pipe is bigger than the outlet pipe on each side. So at that point the exhaust flow will become turbulant and bounce around in there and come out of both outlets of the muffler - thus, it will not flow as good as a similar, or even slightly smaller, single inlet and oultet muffler.

The other thing to think about is baffling. If you get a Flowmaster or Hooker, or some other chambered muffler, it will direct most of the flow out of the driver side outlet since it is the 'path of least resistance' and the passenger one will only get a little bit of flow that is directed out that way with the baffles of the chambers.... Basicaly at that point, it is the same as having a single in and single out, chambered muffler with an extra outlet on the other end of the muffler. That is why the dual outlet, crossflow muffler, with the same side inlet and outlets flows as good as a single in and out....

Now.... if we could just get Mufflex to make a dual outlet 4" crossflow system......

------------------
1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA

The Minnesota F-body Club

 

Thanks Tas and M87GTA, I understand now, cool.

 

I think they do with a spintech muffler.

------------------
-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options