What b pipe to run?

[tumblingtwerp9]

Ok guys looking for some advice on which b pipe to get for my ski.
It has:
ported cylinders
aftermarket carb? (not sure)
riva type 4 dry pipe (for now)
msd cdi
msd coil
This ski is Michael Ratti's old ski and i wanna put the b pipe back on it but i need to order a new one so mod or limited???

 

[Motorheads5]

Mod

 

[luker]

Ok guys looking for some advice on which b pipe to get for my ski.
It has:
ported cylinders
aftermarket carb? (not sure)
riva type 4 dry pipe (for now)
msd cdi
msd coil
This ski is Michael Ratti's old ski and i wanna put the b pipe back on it but i need to order a new one so mod or limited???

id say limited

 

[RiverRat]

limited

 

[SUPERTUNE]

If the ski has the engine I did still in it, I ported the cylinder for the limited chamber.
Chuck

 

[kevbo]

If you are not sure about the pump load then use the long chamber.