I believe this guy. It's hard to believe that even a muffler can make a difference but it does. I noticed also when I "replaced/put back" my stock muffler from an Apexi N1. I only took the N1 out because it was so freaking loud, although I do miss it, but I got to be honest by replacing a really good "turbo" muffler, it did make a difference but not a whole lot. More power w/ you silver Eclipse guy. But this doesn't really matter anymore, I went turbo, ehehehe!!!!