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Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927421 04/14/04 11:34 AM
Joined: Feb 2004 Posts: 120 home - ct school - atl C contoursvt11 CEG\'er
contoursvt11 CEG\'er C Joined: Feb 2004 Posts: 120 home - ct school - atl	Originally posted by DemonSVT: Bassani, Borla, Bosal, & Stock all used baffled mufflers. (I.E crap for performance) I do not know if Brullen does??? Most of these setup's "gains" over stock could be had by the stock setup replacing the resonator and mufflers with straight through design units. The stock setup would likely even out perform most of these then! What do you exactly mean by baffled. The reason I ask is because I have the bassani system, and the mufflers look like they go straight through to me. Also the stock setup is a 2.25" O.D. and the after market systems are 2.25" I.D. so if the stock exhaust is constructed with 1/8" steel that is really only a 2" I.D. exhaust so the stock exhaust with the removed resonator and different mufflers would give much better performance gains, but not as good as the aftermarket systems. 98' Contour SVT lots of go fast mods check em out: http://www.prism.gatech.edu/~gtg285m/

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927422 04/14/04 05:24 PM
Joined: Dec 2000 Posts: 90 palmdale, ca C chezterr_dup1 OP CEG\'er
OP chezterr_dup1 CEG\'er C Joined: Dec 2000 Posts: 90 palmdale, ca	Contoursvt11 makes a good point. There is a HUGE difference between 2.25" OD and 2.25" ID... Im looking for dyno grapsh so I can prove to the Mazda6 3.0L guys that running a 2.5" ID exhaust system is going to provide better gains than a 2.25" ID system. I remember when I was experimenting with my exhaust system on my Cougar back a couple years ago, that the consensus was a 2.5" ID exhaust system was the way to go, especially if you installed headers (which I have on my Cougar). If Draxas had the money to do the testing I would. Right now we are offering a 2.5" cat back for the Mazda6 that splits into 2.25" at the rear into Magnaflow mufflers. The system flows VERY well. But I would like to have dynos as evidence. Again, if I had the several hundred $$$$ necessary to build another 2.25" system and then do comparison dynos, I would.... Nikolas Owner www.Draxas.com 15.09 @ 91.54(corrected, pre-SVT conversion, DiabloChip, and Injectors)

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927423 04/14/04 06:01 PM
Joined: Nov 2002 Posts: 8,143 AZ I IonNinja Hard-core CEG'er
IonNinja Hard-core CEG'er I Joined: Nov 2002 Posts: 8,143 AZ	it'd be kinda cool to see something like what was done on FocalJet where they took 11 of the top exhaust systems and dyno tested all of them... they were all within a couple HP of each other and none exceeded +4 peak HP... IonNinja 2005 Saturn ION-2 Sedan 1996 Ford Contour GL - Collecting dust...Zetec project anyone?

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927424 04/14/04 07:48 PM
Joined: Sep 2000 Posts: 9,602 KC, MO D DemonSVT_dup1 Hard-core CEG'er
DemonSVT_dup1 Hard-core CEG'er D Joined: Sep 2000 Posts: 9,602 KC, MO	Originally posted by chezterr: Contoursvt11 makes a good point. There is a HUGE difference between 2.25" OD and 2.25" ID... There is Not a huge difference at all, but then again I have not seen any aftermarket that was 2.25" I.D. BTW - We are talking ~5% more flow area if it's very thick piping (I.E. negligable) Probably less in actuality. (3-4%) The jump from 2.25" O.D. to 2.5" O.D. is around 25% more flow area. The jump from 2.25" O.D. to Dual 2" I.D. is over 65% more flow area. Even the jump from 2.5" I.D. to Dual 2" I.D. is around 30% more flow area. All those Aftermarket setups I have seen are 2.25" O.D. just like the stock single piping. My guess is people forget the thickness of typical SS piping is greater then standard aluminized. This way it does not crack from heat cycling like SS is prone to do. (I.E. another reason why it lasts 2-3 times as long, but then again weighs 2-3 times as much) 2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927425 04/15/04 01:29 PM
Joined: Dec 2002 Posts: 1,475 Novi or Dearborn MI A akrump47 Hard-core CEG\'er
akrump47 Hard-core CEG\'er A Joined: Dec 2002 Posts: 1,475 Novi or Dearborn MI	So are Magnaflow's mufflers and resonators of the straight-through design? E0 3781

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927426 04/15/04 02:20 PM
Joined: Dec 2000 Posts: 90 palmdale, ca C chezterr_dup1 OP CEG\'er
OP chezterr_dup1 CEG\'er C Joined: Dec 2000 Posts: 90 palmdale, ca	Yes, Magnaflow has the straight through design in their mufflers. No baffles like a Flowmaster or "turbo series" muffler. Nikolas Owner www.Draxas.com 15.09 @ 91.54(corrected, pre-SVT conversion, DiabloChip, and Injectors)

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927427 04/17/04 01:16 PM
Joined: Sep 2002 Posts: 1,746 Hedgesville, WV J Jason43 Hard-core CEG\'er
Jason43 Hard-core CEG\'er J Joined: Sep 2002 Posts: 1,746 Hedgesville, WV	Originally posted by DemonSVT: Bassani, Borla, Bosal, & Stock all used baffled mufflers. (I.E crap for performance) I do not know if Brullen does??? Borla do not use baffled mufflers. They are a straight through design just like magnaflow. "...first he's gonna s*!t, then he's gonna kill us." 1999 Contour SVT Retrojunk.com

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927428 04/17/04 11:59 PM
Joined: Apr 2003 Posts: 3,045 orange county, dprc (ca) J JB1 Hard-core CEG\'er
JB1 Hard-core CEG\'er J Joined: Apr 2003 Posts: 3,045 orange county, dprc (ca)	logic suggest that the straight through design would flow better then the baffled. the question then is how much better if at all? anyone know the numbers? i love that flowmaster rumble so i hope that the difference isn't much. 00 black/tan svt, #2052 of 2150, born 2/1/00 formerly known as my csvt "Nothing in the world is more dangerous than a sincere ignorance and conscientious stupidity." -Martin Luther King, Jr.

Re: Dynos comparing 2.25" exhaust to 2.5" exhaust? #927429 04/18/04 01:20 AM
Joined: Apr 2003 Posts: 2,779 CA J JonnySVT Hard-core CEG\'er
JonnySVT Hard-core CEG\'er J Joined: Apr 2003 Posts: 2,779 CA	Flowmasters are probably the worst. They also only sound good on V8s. They are not baffled nor straight through, they are louvered. 99 SVTC, T-Red, #652/2760-12.8.1998 Mother#@%@!* did I sound abstract? I hope it sounded more confusin than that!

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