ok well im off to have my exhaust flow checked to make sure it is the cat b4 i buy the stuff. what do u guys think. i start it up and it runs fine for about 10 min. then if u punch it it will sutter a little then after about 3500 to 4000 rpm it just dogs out and gets worse the more u drive. but if u let it cool down its fine for 10 min again. my mechanic said clogged cat. it has 115,000 miles