So, i baught a new Lukey cat back with rear muffler delete. I Put it on and then realized the shop forgot to send me a clamp, put it together anyway and sounds terriffic, no leaks even without the clamp. I can drive any way i want and it will be fine, but as soon as i have a full car and i put a certain amount of power the car makes an incredible screeching noise. it's actually ridiculous like a metal scraping metal noise although i doubt that is what it is. i'm guessing it has something to do with my exhaust when the rear suspension is under load. any one else experienced this? i will be putting clamp on within a few days which will hopefully fix it, or is it actually something else?