Original 2b+ exhaust

[steve1506]

Is the original 2B+ silencer supplied with my kit in 2004 okay for passing the IVA or do I need to modify / replace ??? I also have the 4 in to 1 pinto manifold which I think is okay.

 

steve D

[Snapperpaul]

I know there were 2 or more designs of 4-1 manifolds, I have had my engine on an engine dyno and also had calculations done on the 4-1 manifold that came with my RH S3a kit. The calculations on gas flow harmonics for my engine matched the RH S3a manifold and this was proved in the dyno with bike carbs.

caveat; 4-2-1 proved to be better by my combination of carbs. cam, manifold work nearly as well.

Regarding the RH silencer, when I went to SVA it was too loud and I fitted a db baffle which ruins power and affected emissions, IVA has a lower db limit so I can’t see it passing the sound test.

I ended up getting a bigger repack-able silencer made, it was almost twice as long and an inch wider in diameter.

[steve1506]

Thanks for the info, as I suspected a new exhaust would be best just there is so much out there its just knowing the best way to go.

 

Steve D

Edited July 10, 2022 by steve1506