so i was under my car today (lowerign the rear end) and felt something dripping on face ( i had drivin the car a little before hand) and i noticed that at 2 spots (tiny) where the parts had been partially welded and conncected water or w/e the liquid was was dripping through. ( i just had a LM1 installed a lil over a month ago) and recently ive noticed some odd feelings from the car like itll be jumpy or less responsive on the road, could that be why? and if so should i get it professionaly done or could i just buy a little torch and seal the two holes?

 

If you had an exhaust leak before the 02 sensor, then that could cause driveability issues. Seeing that the leak is towards the rear of the car, I doubt that is causing your issue.