As some of you may have read in the tech forums, I recently started feeling the need for an O/R pipe after watching a similarly modded GT with that being the only difference make 25 more RWHP than me on the dyno. I grabbed a BBK O/R X pipe, and very quickly didn't like the sound. The gas mileage went up, the butt dyno also saw increases, but I wasn't happy with it. I then stumbled across a Mac O/R Prochamber that was mislabeled on Ebay and got it for 50.00 +100.00 shipping. Score! I put it on today, and now I am ! It sounds nice and tame when you're idling or cruising, exactly what I wanted, but when you romp it, FTW! The install went much smoother than my last attempt when I rounded the passenger side nuts trying to install the X pipe and had to flat-bed the car to my local shop. I had one of these on my H/C/I'd 87 (my last car), and loved it then too. All I can say is for anyone looking into a new midpipe, Prochamber is the way to go!