Topic: educate me on piecing together a custom 4-2 exhaust

[nomad]

What I have... CB750 K4; stock header pipes, stock motor

What I want to do is to take something like this from Dime City:

and use it with my stock headers to make (or more accurately, have made) a 4 into 2 custom exhaust.

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-exhaust-parts-17-inch-reverse-cone-megaphone-muffler-80-84030.html

What considerations need to be made?  Anything I should know about pipe diameters/ lengths, collectors, muffler exhaust exit diameter, etc.?  Or is it as easy as slapping the parts together and calling it a day?

[Ryan6838]

ill post some pics of the one im building tomorrow.

[socalenduro]

this may or may not be helpful....
but in doing some research myself hoping to make the same type of thing i found this site with fairly inexpensive collectors

http://www.coneeng.com/collectors.html

[nobody]

I've always kind of wanted to have peashooters on my 4-2 instead of my megaphones, I'll be watching this thread to see what you come up with.

[nomad]

I did a lot of reading online and closely examined my stock parts after posting this topic last night.  Here's what I found.  My stock headers are more beat up than I remembered them being, so I'd need "new" original headers.  The parts are fairly easy to find, but if you want to do it right, there's a lot of engineering that goes into a really good set of pipes... tube length, inlet/ outlet diameters, back pressures, power bands, exhaust velocities, positive & negative exhaust pulses, and on an on and on.

At this point, I could whip something together and make it work (to funnel the gases to the rear of the bike), but if I want to do it right (considering exhaust notes and power bands), it's going to take a lot more know how and math skills than I've got.  So, until the day rolls around that I want to open that complicated can of worms, I'm most likely going to get a ready made 4-1 and call it a day.

What was I thinking? 

[socalenduro]

booo do it!
make us proud!

[jacquesleclochard]

Yea man, c'mon, I want to do this too, but I don't have the goods or cash to sink my teeth in my current exhaust! Seems we're on the same page, so if you do it, I can watch and learn!