i have them. I have a magnaflow xpipe. Those things changed the way i feel about my car. I used to think of it as an exotic american sports car, but now with the sound...it's clearly an old fashioned muscle car.
oh btw...i went from older 40 series to the super 40s...incase ur wondering. I also made a custom catback with 3 inch piping after the x to the muffs, then from the muffs back its 3 inched in chrome, no tips...the "tips" are part of the pipes, not an add on
the gas pedal feels stiffer, as if it knows its got more power now. Basically what I did by removing the stock pipes and 2 1/4" 40 series is opening up and allowing my headers to push out more exhaust. THe super 40 is great for this because it compensates with added backpressure, but not too much to loose power. I can feel more power, but its not SOTP
those dyno numbers are before the new catback I made, I didn't feel like paying more money to see what they would be. But after I get like a t/b or something new i will