What is felt can be subjective from person to person but the gains are always there.

 

At which RPM range is it the most noticable again...before red line?

 

yeah its not going to pull like crazy from like 5-10 more hp

 

true..just thought I would notice something.

 

The gains will be almost exactly what is shown in the Sport Z Magazine shoot out test results. Same RPM. Same magnitudes.

Attached below is a A minus B plot of the 5/16" spacer and other various plenum mods. In your case, you can simply follow the 5/16" spacer line to see where and how much to expect.

 

I'll have to wind it out a little more, just took a trip...wasn't too hard on it.

 

As far as not feeling it, it really can be subjective.
A guy in NY who installed a MREV setup on the dyno pulled over 20HP and 30TQ in the plot below. But when he drove home he said he couldn't feel it.

At least to me, 20HP and 30TQ should be very, very noticable.

Most who use the same setup drive away very happy with what they feel.

Regardless of how they are felt, the gains are always there.

 

Yes, the spacer is definitly the kind of mod that produces WOT, top end gains. It won't be noticed in regular driving.