Exhaust size
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This is on the Gm trucks site I belong to, now look at the pipe sizes and the engine size, this is on a 350 Chevy. So for me it makes sense to use 2" duals since you only have a 3.0 V6 and not a 5.7 liter V8.
I'm not the exhaust expert by any means, but from my research I have found that those that use a single in/dual out muffler can usually maintain their low end if they use slightly smaller pipes running out the back. Then cap it off with a bigger echo chamber for the sound/look.
For instance, on my 5.7 I am using a Flow 40 series single 3" in and dual 2.25" out and it kept my low end in place while giving me the high end and mpg gains I desire. Another forum member, noted he used the same exhaust system and was able to maintain his low end as well while getting the duals out back and the sound he desired.
I'm not the exhaust expert by any means, but from my research I have found that those that use a single in/dual out muffler can usually maintain their low end if they use slightly smaller pipes running out the back. Then cap it off with a bigger echo chamber for the sound/look.
For instance, on my 5.7 I am using a Flow 40 series single 3" in and dual 2.25" out and it kept my low end in place while giving me the high end and mpg gains I desire. Another forum member, noted he used the same exhaust system and was able to maintain his low end as well while getting the duals out back and the sound he desired.
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Originally Posted by 04blackedge
I can't find any flowmasters that are 2.5" in 2" out. All the ones i see are 3"/2.5" or the rare 2.5"/2.25". Do they make 2.5"/2"?
Here ya go....
http://www.flowmastermufflers.com/pr...oducts_id=3399
#19
Originally Posted by greygooseranger
Ideally, if you go 2.5" in, to equal a 2.5" out (single), you would need dual 1.75" pipes, so 2" is plenty. If I read correctly, even D. has dual 2" out, and his motor is built.
D is running a free flow open muffler, like the borla or magnaflow design.
If you run the restrictive flowmaster with baffles and such then you can run a little bigger pipes.
#20
Originally Posted by zabeard
a 2.5in and a 2.25 out will be fine. IMO even on a 3.0.
the flowmaster is restrictive enough that you can go a little bigger on the outlet pipes.
the flowmaster is restrictive enough that you can go a little bigger on the outlet pipes.
#21
Originally Posted by greygooseranger
Well if you do the formula, to keep the flow up on a 2.5" inlet pipe, the duals would need to be 1.75. So even if the flowmaster is more restrictive, 2" duals are big enough. IMO
2.25 is pushing it but it will work fine with not much loss in backpressure.
I know some people are running 2.5in and dual 2.5 out. that is big imo
but hey I am just running 2.25 SI and 2.25 SO. and loving it.
I have been down the road of dual exhausts. you dont get performance from duals.
Performance is the best and most efficient flow from your engine.
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On my 4.0 I have 2.5" Header back exhaust with a borla turbo muffler with straight through SI/SO..... I would have gone 2.25 had I gone dual. I think 2" would be better for a 3.0 personally. Well D has 2" and Nickster has 2.5" true dual. I eventually plan on doing 2.5" true dual when I go SC
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