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Old 05-13-2009, 07:02 PM   #1
kozzmo49
 
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axle back vs catback exhaust

Can someone please explain to me the advantages and disadvantages of both of these. Is our stock piping good enough and wide enough where getting an axle back wouldlnt make that much of a difference?
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Old 05-13-2009, 08:28 PM   #2
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Big Bird Style -

The larger your exhaust pipe the easier it is to get the air out of your motor, thus the more air you can put in, thus making more power.

I am unsure what the size is on the stock exhaust though.
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Old 05-13-2009, 09:09 PM   #3
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Quote:
Originally Posted by franknbeans View Post
Big Bird Style -

The larger your exhaust pipe the easier it is to get the air out of your motor, thus the more air you can put in, thus making more power.

I am unsure what the size is on the stock exhaust though.
Yes, but keep in mind that the engine is only going to suck in so much. Also if you are getting much bigger pipes, you are going to have to get new headers as well.

Then when you realize you made more space than you need, get it supercharged.
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Old 05-13-2009, 09:13 PM   #4
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Quote:
Originally Posted by franknbeans View Post
Big Bird Style -

The larger your exhaust pipe the easier it is to get the air out of your motor, thus the more air you can put in, thus making more power.

I am unsure what the size is on the stock exhaust though.
bigger isn't always better.


the stock 2.5 exhaust is pretty big, should support up to about 550 rwhp no problem without being a hinderance. They have nice bends to them too, the real restrictions are probably at the mufflers and maybe the cats.
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Old 05-13-2009, 09:15 PM   #5
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also, with bigger piping you will lose back pressure, which will result in the possible loss of low end tq without necessarily gaining anything up top. the dyno might not reflect it at WOT, but can be felt at part throttle.
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Old 05-13-2009, 09:34 PM   #6
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I am pretty happy that there will be several AXLE back options. This allows for a pretty cheap way to improve the sound of the car and perhaps get some increase of performance. The Cat back systems theoretically offer a larger diameter or straighter bend which could increase performance. Since most of us won't be going with a full exhaust and header setup for ultimate performance we are more likely doing exhaust for a more robust sound rather than all out performance. I anticipate that I will go with an Axle back solution to get a little more performance sound rather than the ultimate exhaust system.

The additional benefit will be to not have to see those huge mufflers hanging under the car.
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Old 05-13-2009, 09:51 PM   #7
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Originally Posted by THE EVIL TW1N View Post
also, with bigger piping you will lose back pressure, which will result in the possible loss of low end tq without necessarily gaining anything up top. the dyno might not reflect it at WOT, but can be felt at part throttle.
http://www.uucmotorwerks.com/html_pr...torquemyth.htm
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Old 05-14-2009, 01:41 AM   #8
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Thank you ^

Remember, you can get different HP/Tq ratings with different mufflers. Just because you go with Borla rather than Magnaflow, it doesn't mean you're going to get more Tq. It depends on the size of your pipe, initial HP/Tq, etc... It would be cool if someone did a comparison on stock Camaro's similar to these:

http://allfordmustangs.com/forums/5-...-shootout.html
http://www.v8s10.org/forum/viewtopic.php?f=43&p=155840

As you can see, that was 7 years ago, and there wasn't THAT much of a difference. Of course, if you ran the test again, the numbers would change. Also, I have no idea if this was an average or what... It would be cool to see some new tests.

I searched around for axel back vs cat back, and found several different answers, basically:

If you're wanting more HP/Tq gains, just replace the entire exhaust system (including Long tube headers IF AND ONLY IF you don't need to pass inspection! If you do, get a high-flow cat put on there).

If you're looking to change the notes your exhaust plays, get the muffler changed out.
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Old 05-14-2009, 01:50 AM   #9
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Good info, thanks guys
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Old 05-14-2009, 02:25 AM   #10
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good posts, dudes
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Old 05-14-2009, 06:26 AM   #11
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Quote:
Originally Posted by Kyle2k View Post
There is more involved here than this article discusses. This article seems to say that the biggest exhaust you can bolt on your car results in the most power. This is far from reality, especially at lower-midrange rpm. An appropriate size exhaust produces the best all around power, too big of an exhaust will always result in less low end power. This has nothing to do with A/F ratio. The exiting exhaust gases of any engine and the velocity of those gases create a scavenging effect to help remove burnt gases and draw in a new intake charge (where the intake and exhaust valves are both open-the overlap). This is what makes long tube headers so effective. Put a set of 2 1/4" race headers on a bone stock LS1 and I guarantee you will lose a ton of low end power. The same thing applies, maybe less so for the rest of the exhaust being too big. The further downstream, the lower the effect on scavenging is.
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Old 05-14-2009, 08:07 AM   #12
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ok question say if i were to change stock pipes from 2 1/2 -3 would that be that big of a difference
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Old 05-14-2009, 09:33 AM   #13
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It's not a "big" difference but I was running a 3" exhaust on my Srt-4.

Also, does anyone know the manufacturer of the mufflers on the GM exhaust?
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Old 05-14-2009, 09:36 AM   #14
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Going from 2.5 to 3 on a stock motor will net you a lose of bottom end TQ. You will see it on a dyno and feel it alittle but i don't think 1/4 mile times would suffer. As said before dual 2.5 pipes can support 550rwhp. A plus side or down ( dending on ears) is you will gain more bass in your exhaust note. On my 93 I run long tubes to a off road y-pipe into a 4in i-pipe to a stock muffler with the square tips. I've yet to hear a car sound like mine.
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