It seems to be running okay once it gets going, although I need a second opinion on that, but when it idles it's a different story. When I start it's at 1k and after a few sconds it'll jump up to 1500k stay, and drop down, go up one more time and drop down, and when it does the second time it makes a sound almost like grinding a gear with a mtx. Also the check engine light blinks 3 times and goes off, but will turn on again after driving for a few minutes. The dynomax sounds great! Perfect for what I need, not loud on idle or regular driving, but when you get up into the revs and the secondarys it screams. I blew by my wife last night on the pike at 110 or so and climbing hard and she said it scared her because she wasn't expecting me to do it. My radio is driving me nuts too, I got the harness with the rca's (fdk2) so I coulds use the facotry amp/sub with my head unit and I can't get it to work, when I bypas the amps it works, but when I hook in, nothing. I got it out the door for less than 2k with a 102k on the motor and a recent 60k, and the dynomax, kirk did a good job (I'm hoping this idle issue is something else).