i had the same exsact thing... that lil y pipe of the back of the turbo that has the two up pipes comin to it were crack causing me to think both my up pipes were leaking.... i got it fixed at this place i always go to cuz its to much for me to try and tackle being stuck without a truck and not having expereince. but i notice better turbo responce 2-3 extra pounds of boost and about 45 more miles on each tank of gas but thats with me drivin it hard cuz i always do it would be more i a babied it. but i was prolly missin some extra horse power