Do they make any kind of noticeable difference or not?

 

In theory it should, but I don't think it will make a noticable improvement for $40. I didn't notice any difference with mine.
The dyno may say a 5hp and 5 lbs tq, but that is, more than likely, do to dyno error, or different weather conditions when each dyno was done.

Travis

 

Yes, air foils work. No, you will not feel any noticeable difference.

 

I think www.ws6.com did a dyno on this...???

 

Yes they work.But you will not notice it,you may notice a little better throttle response.

 

My car whistles now with mine in there.

I took one from an L98 which has the airfoil going halfway into the intake elbow.

I ground down the edges and mated it upto the LT1.

My IAC counts changed at idle. That was about it. Mind you I'm not gonna notice a 4-6hp gain either.

 

does the SLP air foil fit on a 58 mm TB (edlebrock)??????

 

The edlebrock 58mm already has one built in it.

 

Are you sure?

 

I paid 15 shipped for mine, and i found out that i already had one in the car at the time hehe

So, i wouldnt pay much for one.
In my case, i didnt have to pay anything ata ll

 

The 58mm Edelbrock Throttle Body does not have the air foil built in.

 

I didn't think so, I know the holley 58mm has one built in, that is why it cost way more...
so back to my original question, does the SLP air foil fit on the 58mm TB??