Quote Originally Posted by Vteckidd
You guys throw out big terms like Reversion but do any of you have ANY PROOF what so ever?

How much vacuum does a motor pull at closed throttle? what are the pressure differences on the back side of the exhaust valve?

I guess me and thousands of others are just lucky. Prove to me reversion happens, and it causes motors to blow up strictly from running OPEN HEADER.

Its a myth and its bad information
I myself would never run an open header, especially on the street. Its just too damn loud and obnoxious. However, I do remember back in the day when vtecKidd ran around with an open header on the old crx with no issues, even on some cold winter nights street racing. As far as power goes I have seen guys at the track unbolt their exhaust trying to lower their times and the reverse happened.