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Discussion Starter #1
I've had a few different exhausts on my 96 sport, and having a freind with a dyno has its benifits. I thought I compile my sheets and share the exhaust and hp/tq numbers. Unfortunatly I dont have a stock baseline, could leavet he car alone for that lone when I got it :D Base mods to start with are 90mm L-MAF and chip. Each run is 4 pulls, best hp/tq posted.
First run, september 01
Exhaust setup: Flowmaster cat back (single 2.5 manderel) without mufflers, Y cat deleted via Y pipe.
182.7 rwhp @ 4250 RPM, by 5000 RPM the power dropped to 165
260.5 rwtq @ 3550rpm

Second run, April 20, 02
2.25" compression bent true dual w/ H pipe into 2 18' long glass packs. (best sound)
186.2 rwhp @ 4200 RPM, by 5000 RPM power only dropped to 172
251.8 rwtq @ 3600 RPM (note the drop)

Third run, April 27 02
Jerry tune
185.9 rwhp @ 4200 RPM, by 500 rpm dropped only to 178.
256.4 rwtq @ 3500 RPM
(90% humidity, uncorrected #s)

4th run, friday
3" single into 2.25 dual, all manderel. Dyomax super turbo mufflers. All custom made
188.3 rwhp @ 4100rpm, power curve flat untill 5050 RPM
273.2 rwtq @ 3650 RPM

No torque numbers were taken from the TC flash spike.
Hope this info is helpfull to those choosing an exhaust.
I realy like the current 3", very quiet, great sleeper exhaust. I painted it all flat black to retain is "sleeper'tude". The noisiest part is where it grabs tire on the 1-2 shift :D
 

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what comes before the 3" single in that last one? any cats, etc? You've got some good info there. Happen to have any pics of that last setup?

-jw
 

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Discussion Starter #3
all exhausts retain the two cats on the downtubes, so they are compatible with you chipless guys and your OBD2.

I have a couple snapshots of the new pipes, but none didgitized. Its frairly simple. the OE exhaust was chopped off at the transmission mount crossmember. The OE downtubes are 2.0", so my first section ( the first bend inward) of exhaust pipes are 2.125", the next bend (leading back into the Y) are 2.25". It then goes intot the single #" manderl pipe untill just before the pumpkin. It plits just ahead of the pumpking an the two 2.25" pipes goe straight back past it, then turn off toward the mufflers. Mufflers are mounted at an angle. I had to fabricate both Ys, the pipe I used were Manderel U bends aquired at Jegs. I cut them and piced them into my exhaust, then welded it alltogether. Whole system took about 12-15 hours, so If ya want one, i can make ya one...but not cheap :D
I'll see if i can get some pics hosted somewhere.
 

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Eric,
I'll host your pics.

I'm liking my dynomax ST system more and more also. Real sleeper I agree. I deleted the resonator, and replaced with pipe like you recommended.

Nice setup, not bad for $199 minus 20 dollar rebate.

Justin
 

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Discussion Starter #6
"....avoid any "unwanted" attention from local authorities"
muahaha, when i first made my true duals, I didnt exactly budget for mufflers...so I went without. When the sherif pulled me over, he complimented me on the sound. Jesse (Fubarian) can vouch for it, one of my proudest moments :p
Its no suprise the hookers flow so well. They consistof a case full of baffling material, with a pipe full'a hole leading from the inlet to the outlet. It flows like a straight pipe....because it is a straight pipe. :D It's doubtfull that it does much of a quieting job, so for $54, you get about 8-10 lbs oud dead weight. If not concerned with noise, you realy only get mufflers to appease law enforcement or race class specifications. Plus, in flowing like a straight pipe, you also gain no low end. That was the reason I designed my system the way it is, to gain torque.

As for expanding on the graph, how about scavenging? As the exhaust gas gets further from the engine, it cools. As it cools, it contracts (molecularly). in contracting, it looses volume. So, the CFM rate at the tail pipes can (in theory) be less then the CFM rat at teh down tubes without hurting performance. How much it hurts depends on how well your system scavenges. We have the benifit of a loooong azz car with lots of pipe, exhaust temp probably drops quite a bit.
 

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I scanned a couple of pictures from the Nov 2002 5.0 & Super Fords mag that gives some more information on this subject on HP and Torque at differant RPMs, and also sound levels of each.
For the full chart of <A href="http://www.qsl.net/st0f/mufflers.jpg"> mufflers </a>and for the sound <a href="http://www.qsl.net/stof/muff-db.jpg">levels </a>of them.
 

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Hey Eric, any improvements you would do to this one to help increase torque before we put it on my car. As it is now though will be an improvement over mine.

Second run, April 20, 02
2.25" compression bent true dual w/ H pipe into 2 18' long glass packs. (best sound)
186.2 rwhp @ 4200 RPM, by 5000 RPM power only dropped to 172
251.8 rwtq @ 3600 RPM (note the drop)

Oh, my flywheel got here today might have the TQ installed by this weekend but don’t know for sure yet. I really do not want to drive this thing in the winter. Wish I had a beater car with a good heater to drive during the winter and work on the bird. Oh well this is its last winter. I will have it paid off before too long.

Later,
jay
 

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Discussion Starter #12
umm, well, we could make it more restrictive, but I dunno quite why. Your lauches are gunna be just fine with the new stall. this exhaust will be a heck of alot better then your stock equipment. You'll likely see gains accross the board.
hey, are you getting your car Jerry tuned? If so, toss in $5 and I'll weld in an O2 senson "bung". It'll be much more accurate then the ones they bolt to the tailpipe, tuning will be more effective.
 

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Well with this wheel bearing I just replaced and the brake work I dont know if I will have the ash I will try though. That set of heads, and alum drive shaft down here are looking really nice though. Hey do you need a set of 24 lb injectors??? I have a set I may not need and if Derrick doesnt need em for his stang project I may be looking to loose em. Oh and I have to get that converter installed.

later,
jay
 

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Discussion Starter #14
24#? why would I need a p\/ssy lil set of injectors like that? :p
I already have a set of 42#s.
And, given that I'm unemployed, I may be forced to sell the system elseware, dude. :( Lemme know
 

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Here is a summation of the data from 5.0 Mustang and Super Ford.
<h3>
<pre>
Muffler Torque at 2750 RPM Sound at Idle 2000 rpm WOT
Borla XS 213 80 90 110
Maganaflow 201.2 82 91 114
Edlebrock 201.2 84 93 118
Spintech 201 87 97 116
Dynamax Ultra 200.7 83 94 113
Mac 199.5 87 98 119
Hooker Air 197.4 87 94 114
Flownaster 3 cham 196.3 82 93 115
Hooker Max flow 195 80 90 120
Borla XR 195 83 96 118


Muffler Peak HP Sound at Idle 2000 rpm WOT
Bassani RS 373.7 84 96 Max
Borla XS 373.3 80 90 110
Hooker Max flow 373 80 90 120
Magnaflow 372.8 82 91 114
Hooker Air 372.1 87 94 114
Bassani Street 372 83 96 120
Flowtech 372 86 94 119
Mac 372 87 98 119
Spintech 371 87 97 116
Borla XR 370 83 96 118

</pre>
</h3>
Looking at these, you will see that within the top 5 of both Torque
and HP are Borla XS and Magnaflow. They are both amoung those with
acceptable sound levels. So, you can have your cake and eat it, if
it is your flavor..... Borla XS is the over all winner.

.I do wish they would have included a few others,like the Flowmaster
2 chamber and Dynomax Super Turbos.
 
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