I doubled up 2 tb spacers today on my 4.0, and put it on the dyno, made 15 hp. " sIKE", i BET THAT GOT SOME OF BLOOD PUMPING! tHEY MAY NOT MAKE ANY HORSEPOWER, but they do make pretty good wheel chockes. Just wanted to wake everybody up, have a nice night!

 

lol. They make the nice whoosh noise now.

After people figure out they're not helpful for HP, that seems to be their justification for having them. They make a "whoosh" noise if you get on it. I wouldn't notice it, my Flowmaster is too loud.