Does pluging the 2 holes under the supercharger gain any power?And how much more louder does it get?Any before and after dyno test been done?Any videos? Or pics,If this is a repost my bad.

 

no power
increased efficiency
yes its louder

 

All it basically changes is the sound, it makes the whine a little bit louder.

 

search...there is lots of info and threads on this. there is a "how to" and it has pics and vids

 

The “back-flow” slots were on the earlier Eaton designs as it reduced the back-flow event, which reduced noise (slightly). Plugging the slots does improve flow, but ever so slightly. The impact from an efficiency standpoint is negligible. I would be more concerned with the method of “plugging” the slots as welding will of course distort the housing and using aluminum filler runs the risk of coming loose, thus resulting in a destroyed unit altogether. In my opinion it’s not worth the minimal gains vs. the risks in plugging the slots.

 

Cool thanks man.But if it increases the effciency would that in return increase the power?

Ok thanks. Ill leave it be .

 

No, not really. It's like 1% efficiency, so you literally won't notice it.

 

Not only would you not notice it, it won't increase performance. Horsepower and efficiency are two different things. The air will be able to flow over the surface easier without the holes, but the same amount of air is moving so there is no increase in power. Now if you were to port it, there would be more air moving through it, thus creating more power.

 

i thought a port job was an efficiency thing rather than power....hmmm- idt you would see much of a hp gain unless you got a port job and a 3 inch intake?

 

yea seems kinda risky for what you get...the blower is pretty loud with just an intake