is it really worth it? dyno #'s dont mean jack to me. who has went to the track and dropped there single exhaust( i have a 4inch mufflex) for true 2.5 or 3" and seen a true increase in ET and MPH?

 

I havent heard of anyone swapping exhaust at the track, but the under the curve gains from most true dual setups dont lie, but I doubt the gain is very significant over a good flowing cat-back like yours at the track. I am going duals for the sound as well as the power gain.

 

not dropping and changing it at the track, but you know. mjost people do other mods aas well and say the true duals helped, when really it was other mods too.

 

Im starting to wonder about true duals myself. Supposedly one 3" pipe flows as well as 2 2.5" pipes. If this is true, then how much gain can come from 2.5" true duals? On paper a 3" catback should be plenty. For me the best thing about duals is the sound. Especially with the xpipe.

 

The best thing about the duals is the sound not the power increase. It will get rid of the rasp and really makes the car sound like it has some big gonads. Im sure the power increase for most of us is negligable when going from a decent y setup to true duals.

 

2 2.5" pipes will flow about equal with a single 4" there is a thread on here where a guy actually measurd the flow rate of the pipes. i cant find it, but its a good post.

 

Okay well, while I don't have side by side track comparisons. My friend has a WS6 with all the mods that I have minus the true duals. Before I got the true duals, we both had a lid, ram air (fast toys for me and brian green for him), Hooker longtubes, with offroad y-pipe, no cats, and Magnaflow muffler. Are cars were identical when it came to performance mods. Literally identical right down to brand names of the performance parts. We raced several times on the street and everytime he would pull me just a tiny little bit at the end of each gear (probably due to his more effecient ram air). By the end of the race I would say he would have no more the his front tires even with my front end. Very close, and it happened that way everytime, nightime, daytime, cold or hot outside.

Now I have true duals. He says lets go test them out. We got out and raceed and this time he doesn't pull me at all, not one hair, dead even. Now we shift into fourth and I walk him hard, real hard. By the end of the race (the end of fourth gear) I have about a car length and a half on him. And that happens everytime we race now, nightime, daytime, whenever. And the true duals were the only thing I changed, honestly.

That was enough to convince me that I did something right with going to true duals.

 

Wow you saw one hell of an increase then, what kind of duals/mufflers do you have?

 

if you look in this exhaust forum you will see pics and details on my setup. or go here :

https://ls1tech.com/forums/generation-iii-external-engine/125581-pics-true-duals.html

 

thats a nice setup!

 

what did you have before the true duals?

 

Magnaflow, just like my friend with the WS6. Same headers, same exhaust, same lid, everything.

 

that is a very nice kit. i like the way you have the hangers on the rear seat belt bolts.

i will notch under the rear seat if i ever go true duals. i have the pass side notched for my 4" mufflex. cut a lil bit of the intermediate pipe and its hidden completley, cant see at all.

 

I gained about 1 tenth and 1 mph in the 1/4 by going to true duals with LTs from mac headers a y pipe and catback setup. It is impossible to tell in my case which did what because I installed different headers when I went to the true dual setup, but I can say that the power increases from the change were significant. Although my best runs in the 1/4 were only .1 ET and 1 mph in the 1/4, transmission was not shifting correctly when I went to test out the new exhaust system. Even with some shifting problems, I was still able to run a new best time. So, the gains were probably actually better than what I saw.

 

im going from my custom Y w/ carsound cats and magnaflow catback to 3" duals, x-pipe and 12" bullets. i wanted it more for the sound more then anything, the gains under the curve are nice as well .

 

Going to true duals is more than just flow volume. Following a y-pipe setup in the f-body, true duals always gain power, but more importantly, area under the curve (just like long tubes).

Why? Scavenging. Any x-pipe draws air out of the motor like long tubes do. It's NOT possible to do this with a single pipe, no matter how big you go.

BTW, here are volume comparisons for reference:

http://www.carcraft.com/techarticles/69238/

 

Ok you so the increase of power with the true dual but your friend had a Mufflex 4" in his like TJ??His asking if he change over from mufflex 4" to true dual worth it...

 

who said anything about a 4" Mufflex. I am sorry I am having a hard time understanding your post. We both had a 3" MagnaFlow catback, then I switched to true duals.

 

How much ground clearance did you lose, it looks like it hangs down alot lower.

 

I probably lost less than a 1/4" worth of ground clearance going from the 3" catback to the true duals. The shop did a real good job of tucking it up under the car.