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Yeha I installed exhaust on a 4dr lx and i hear a slight rumble in the front during starting the car and while hitting first gear. Im gonna check on whether i just didnt tighten the pipe to the cat well enough tomorrow any other ideas on what it might be? Or if its just gonna be normal for a lil while till it gets fit to the car

 
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Most likely you have a connection that isn't complety sealed. I don't think those u-bolts seal completely. They will do it good enough so you can't really tell there not leaking but they really need flanges or to be welded. Have some start the car while you are under neath and you will identify the problem very quickly.

 
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Another good way is to start the car and get under it and feel around for air leaks around the seams. Or use some baby powder and squeeze it at the seams and then you will see it blow away where the leaks are. Mine has a leak cause the u-bolt is not sealing good....I am just going to have it welder this spring I think.

 
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Yea, I couldn't get the connection from the muffler to the midpipe to seal for the life of me. After an hour of trying, I broke the u-bolt I screwed it so tight. Then, I said screw it, took it to midas and they welded the connection. The guy found another connection that was also leaking but just barely. 45 bucks for 2 welds but its done right. IMO those u-bolts are a cost cutting measure but the system was only 300 so....