which brand is good, I lloked at forced performance and i saw two 10.5 there one has a single flapper and one has a twin flapper. whats the difference?

 

Single flapper is the new design. Dual flapper is the old design that was on the 9.8 hotside.

Brand should not be an issue when getting a 10.5. IT should just be a regular Mitsu turbine.

 

is the single one better or both of them give do the same purpose and adds the same hp

 

they should all be Mitsu turbines ragardless of single or dual flapper. I dont know of any place thats sells their own versionm of a 10.5 turbine housing. All Mitsu!!!!!!!!

 

The single flapper is supposed to be better (smoother flow) but i dought you would feel or notice any difference between the two.

 

+1 on original question

Also, what are the advantages and disadvantges (plus/minus) or the single flapper compared to the dual?

 

mitsu's 10.5 hotside is the single flapper , so a single is the one i would buy
you could try getting it from mitsu parts department

 

I just looked at the designed differences and it appears that I have the dual flapper.

I would assume the single flapper is an improvement by mitsu and that it holds boost better.

It has much less surface area for exhaust gasses to push the door open when not commanded (under boost build). I would say that the single flapper holds boost better with factory actuator.

If you have the dual flapper (like me) and are sad, get an aftermarket actuator and the design difference wont matter.

 

So, does a single flapper hotside fit on an originally double flapper turbo without any modifications?

 

Yes

 

Both the Single and Dual flapper are designs. The dual flapper 10.5 hotside was on the evo 6.5 RS TME turbo. In 2005 revised the WG flapper from a dual flapper to a single flapper, it just happened to coincide with the switch from 9.8 housings to 10.5 housings. Every mitsu housing made from 2005 on is a single flapper 10.5.

- Steve

 

ty

 

Thanks for the info