4V exhaust question.

[Fruity]

hi fellas,

i'm contemplating changing my exhaust configuration which is a 2-1-2 into a 2-1 system. how would it change my bike in terms of
i) performance
ii) sound
iii) fuel consumption

bike is a 2004 monster s4r with pc3, open airbox and current pipes are termi slipons.
i've done quite a bit of search on this forum and other forums as well but can't really find answers that explain a 4v condition. only found info on 2v. so appreciate if anyone can give some feedback.

thanks  

ken

[Fruity]

"bump"er nobody loves me   

[Speeddog]

I've got no FHE with them, but what I remember hearing is:

2-1 systems tend to be loud, as they don't usually have a large enough muffler.
Usually there's tuning issues with 2-1 systems that result in less power.

[Fruity]

thanks for that response speeddog.

"Usually there's tuning issues with 2-1 systems that result in less power."

as long as there's low and mid range i'm happy.

tuning issues even on the dyno? would a good tuner be able to handle that?

cheers.

[Speeddog]

A good tuner should be able to get it set up on a dyno.

If you can, get a dyno run before you change it, so you can see what you got.

[Oldfisti]

A 2 into 1 system should gain low end power due to the scavenging effect.


Yes it has a chance of being louder due to only having a single mufler.


If possible have your dyno guy tune each cyl individually. You would be surprised at the discrepancies between each map.

[Fruity]

thanks guys. really appreciate that. i'll get the dyno guy to do just that.