[joea]

I spoke to Dennis at DSC and asked him about it beause I didn't know what it was for. The TunnelWedge manifold I have actually came with the plug installed. Dennis told me it was primarily used on street applications and did not have much use on a high performance application.

Then I read some info on the ERA site where Bob Putnam recommends drilling a 1/4" hole in the thermostat flange if you block the bypass. Seems to be mixed opinions about it...several oter seem to have it blocked as well. I'm planning to take the middle road and go with Bob Putnam's smaller bypass in the tstat.