Hey guys, Im thinking about going with a dual exhaust setup when I go turbo, what size pipes should I go with each side?
I know there isnt any dual exhaust kits and this will have to be custom made so please dont post that, im well aware.
If you dont like dual exhaust and think it looks stupid, GREAT dont post here not looking for personal styling opinions, thanks guys.
on a sock engine I can see how dual exh wouldnt work out so well , but with turbo it should be fine right ?
dual exhuast doesnt make sense unless it is twin turbo.
the exhaust system is as big as the smallest point, and in ur case, will probably be the turbo outlet. make a single pipe going staight out the back. For a stock block u will not need that open of an exhaust.
3 inch single pipe
How do people get away with a dual exhaust setup then ? I see lots of integra’s and civics at the track running dual setups. nothing special done to the cars, they run same times as everyone else. Is it because they run 2 1.50 pipes and put ricer tips on ?
I too see alot of rice being thrown around.
I don’t ever see actual dual exhaust, but people do split the pipe in the rear for twin mufflers.
generally the split point in the pipe is right after the rear LCA. when the weather is colder out and cars tend to steam/smoke a bit more noticably you will notice the smoke only comes out of one pipe, the passenger side one.
the dual setups on 99% of the honda civics out there arent doing anything at all except in the owners eyes making the car look faster.
s yo ucan just split the end of your exhaust and make it two pipes just for looks ? thats what I want to do 
it will smoke from both sides if they do it right.
straight pipe out the side FTW!!
not entirely true. if it were length would not be part of the calculation for resistance. two mufflers in parallel flow way better than a single muffler too.
Do you have proof of that Krazy guy? :shrug:
btw…
Wouldn’t a true dual exhaust require a set of 2 - 1 headers extending to the end of the exhaust system? I believe this is possible as long as you have the ability to maintain exhaust velocity towards the higher rpm (to completely eliminate the exhaust so that no exhaust gas has probability of creeping back into the combustion chamber).
With a turbocharger (or at least an engine mated to one turbocharger) you will have exhaust from all 4 runners go through the turbine and then out one opening. If you wanted to have one pipe split into a pair of pipes to achieve a dual-pipe - to - tip setup…
Originally posted by MichaelDelaney
as long as the total cross-sectional area of the 2 tubes (or the total summation of the diameters of the 2 tubes) is not more than the area or diameter of the single tubed exhaust that’s been properly sized for your peak hp goal, you’re ok. If you exceed that then, it’ll be gutless in the low to mid rpms…and slow in acceleration.
-Hoots
i read that like 4 times, now my eyes hurt. maybe i will go shower and try reading it again in a bit. which part of my statement are you looking for proof of?
Man, I forget. :surrend:
OH! Relating your idea of two mufflers in parallel flowing better than a single muffler. :think:
I don’t see how that can be possible. Is it because you can run a smaller diameter with each piping and the exhaust velocity increases?
If you make the piping too small, the efficiency to flush out all the exhaust will diminish.
-Hoots
say you want a 4" stick. to split into two, you need two 2" sticks. now an exhaust is measured by the cross-section, a circle, so you need to use the formula for the area of a circle, pi*r^2.
3" exhaust = 2.25pi square inches of cross area
twin exhaust = 1.125pi square inches each
each should be about 2.12" in diameter
What exactly would the benefits be? Is this a method to sound different?
-Hoots
looks, and/or ground clearance.
what car is it that they sell a dual 2.5" exhaust, side by side, mainly for ground clearence. it also outflows a 4" exhaust. maybe sti? i forget.
i have a dual exhaust on my teg i will show pics tomorrow when it is sunny out…
Both sides work…its not just for looks…it isnt custom either…i have 2.25 piping…stay tuned
if u honestly wanted it. i can see someone doing what the accords have. have a single pipe running and then a y cut into two diffrent mufflers but it just seems like more weight to the rear of the car…
josh
exactly. if it was for performance, they probably would have gone twin pipes. otherwise they just wanted ground clearance/looks.