I may be wrong, but I thought that installing headers on my car would make it louder. I just installed a set of Edelbrock TES shorty headers and found quite the contrary. I do not have a cat converter and I have a flowmaster muffler with turndown tips which makes the pipe after the muffler about 8-10" long max.

My car now idles quieter but gets loud as hell WOT.

 

I confer. My car with the cat idled quieter with the headers. Without the cat at the track it idles louder.


Jason

 

anyone else have this happen? or maybe know why? It's not really a pressing issue, I'm just curious as to why this happened, accoustically I wouldn't find this realistic. Now I think I might want to make it idle even quieter (if possible) to add to the "there's no way that thing runs xx.xx @ xxx mph" factor, aka people thinking it is slow because it sounds like it stock hehe.