dbarrett231
New member
i notice a lot of people have 2.5" pipe for the exhaust. im just curious if i ran the anaconda down/mid pipe with a 3" catback with a res if it will work or will it be to much airflow?
3" exhaust
- Thread starter dbarrett231
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SONIC1.4
New member
I thought that wasnt the case with forced induction vehicles? I may be wrong though.
Turbos generally appreciate an oversized exhaust. That being said, If was going to do it over, I would have built myself a 2.5" for this car. The 3" I built drones like a MF'er. I had to build a helmholtz res to subdue enough not to go crazy. Overall sound is great, and it's not loud either. However, from 3-3.5K under moderate load, it resonates through the interior badly enough that the plastic parts start to buzz....
When I was testing the Anaconda, I tested it through the stock exhaust, and without any exhaust. The difference was only 4whp and 5wtq.
Based on the data, the 3" I made is only adding noise in the cabin. A 2.5" exhaust should be more than adequate and not make your ears hurt.
When I was testing the Anaconda, I tested it through the stock exhaust, and without any exhaust. The difference was only 4whp and 5wtq.
Based on the data, the 3" I made is only adding noise in the cabin. A 2.5" exhaust should be more than adequate and not make your ears hurt.
ahtoxa
New member
You could well be right and MPFab knows more than be by default, as he has products for the Sonic.
dbarrett231
New member
So basically all the 3" will do is make a ton of drone and piss me off and ill end up going to a 2.5" anyways? Thanks for the info I always like to get a second opinion or someone’s personal experience before I do something. So what I will end up doing is the anaconda with a 2.5" straight pipe with a resonator. Now for a resonator any recommendations? I want the exhaust to have a growl to it.
dbarrett231
New member
I would never get pulled over for it here in Alaska. We can do whatever we want for exhaust. My 5.3l Silverado is straight piped and let me tell you that thing is obnoxious on the outside.
OK. If you guys aren't running mufflers, disregard what I started above. I run 2 mufflers on the 3" and the 2.5"cat-back I did for Modified's Sonic used two mufflers as well.
Without mufflers, it's gonna drone regardless of the size tubing you use.
Sent from my XT1060 using Tapatalk
Without mufflers, it's gonna drone regardless of the size tubing you use.
Sent from my XT1060 using Tapatalk
sx sonic
New member
So no sound suppression = drone no matter what size exhaust.
Muffler and/or resonator= no drone regardless of pipe size. With the caveat of which style and size muffler/res is used.
As for backpressure. It don't matter on any car! Exhaust flow, velocity, and pressure wave tuning is what affects peak power and where the powerband is stronger......... For NA or supercharged engines.
On turbo engines you want max flow after the turbine, pressure wave tuning and velocity are hugely irrelevant and there is no penalty for going BIG, but there's usually some good gains.
I've written some really in-depth posts about the matter that are floating around some exhaust threads on here.
laborsmith
New member
A properly designed resonator takes care of drone while any muffler reduces decibels.
Given that, I chose resonator without muffler and that works well for me.
Laborsmith
Given that, I chose resonator without muffler and that works well for me.
Laborsmith
Yosemite Sam
I Hates Rabbits!
I'd go with a magnaflow muffler on the straight pipe. I have it and its still loud, growls like a lion, and has no drone!
This is exactly what I have - the anaconda, 2.5" after the cat and a Magnaflow muffler. You can hear me coming!!
SONIC1.4
New member
Hellz yeah!This is exactly what I have - the anaconda, 2.5" after the cat and a Magnaflow muffler. You can hear me coming!!
I have no cats! MEEEOOW
