2.5" or 3" exhaust
#1
2.5" or 3" exhaust
Im running a high comp b20v, plan on getting a street sweeper header from sigma six racing, what diameter exhaust size is better to run with? 2.5" all the way or 3" all the way? If end up doing 3" will probably use WS2 80mm muffler or 2.5" with magnaflow. any thoughts?
#2
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Re: 2.5" or 3" exhaust
You'll make more power up top with the full 3 inch system, but the lower end might lose a bit compared to a 2.5 inch setup. What compression ratio? What cams? Any head work?
#5
Re: 2.5" or 3" exhaust
here's my set up:
B20v setup
gsr head stage 5 port
b20b block 84.5 mm bore
weisco 13:1 pistons
eagle rods
gsr crank
acl race bearings
skunk2 internals
skunk2 pro 3 cams
itr tb
omni 70mm tb
competition stage 5 clutch and ultra light flywheel
aem fuel rail and fpr
RC 750injectors
Gsr tranny
B20v setup
gsr head stage 5 port
b20b block 84.5 mm bore
weisco 13:1 pistons
eagle rods
gsr crank
acl race bearings
skunk2 internals
skunk2 pro 3 cams
itr tb
omni 70mm tb
competition stage 5 clutch and ultra light flywheel
aem fuel rail and fpr
RC 750injectors
Gsr tranny
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#12
Re: 2.5" or 3" exhaust
I found this article that you should check out about exhaust.
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/article-exhaust-system-basics-2970428/
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/article-exhaust-system-basics-2970428/
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#18
Honda-Tech Member
Re: 2.5" or 3" exhaust
I do wonder though why do several race teams and such use smaller piping? TODA Racing exhaust is clearly labeled off road use only and their intent is to make the most out of a race motor. A Spoon N1 is a race exhaust and wasn't intended for street use yet the outlet is only 2.5". I understand tracks have sound regulations but there has to be something more to it.
#19
Re: 2.5" or 3" exhaust
but dont get me wrong, i've seen ppl throw on 3" set ups on their all motor and put down some decent numbers. if ur taking EVERYTHING into calucation though like weight, efficiency, etc then i would rec 2.5" for a solid na.
sidenote: is there any heavy block work being done?
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Kangolbrand
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