I have an 03 Evo and plan on upgrading from a 9.8 to a 10.5 hotside.
Can someone explain the difference between a 10.5 Hotside single flapper versus the 10.5 hotside dualflapper?
Which is better?
I've seen these 2 items advertised at about the same price and wanted to make sure about the differences before making the $$ plunge.

Oh yeah, BTW I did search but nothing specific...

 

I think the single flapper has slightly more flow area when the flapper is open than the dual model.

 

The dual flapper is the older design found on the TME turbo. The only performance difference that I have ever heard on here is when people run the Ebay 02 housing. Some of those with the single flapper seem to have a boost creep issue while those using the dual flapper report no such problems. I personally just sold my single flapper for a dual flapper as an insurance against the boost creep. I may not have gotten it but why take a chance when it is already apart and so easy to replace.

 

I thought the single flapper was the style thats on the 05+MRs. I personally got the dual flapper.... it just looks like its a better design IMO.

 

I have the single flapper and it was the one of choice back when people started to put the hot sides. I have never had any trouble with it.

 

so which flapper design does my 05 rs have? is the single flapper something thats new in the 06's or what?

 

My 05 VIII had the single flapper. My car is not the MR or RS (so we are perfectly clear on that)