LoL, if you removing the FACTORY mid-pipe you will see gains in HP ~25, and US Factory muffler are not that bad... but can get another ~10 there, I like Go over noise.I will got the jun BL DP ( mid pipes) put on tomorrow, so it should lighten up the car a little bit and I am expecting no more HP gains just lighteras it removes only the secondary cats , thanks goodness !
