Just had a catback exhause installed. Now I am loosing oil, over a quart in 100 miles. The car is not smoking, oil seems to be coming out the air intake. Have a KN filter that has engine oil in it. Engine runs great, lots of pep, getting about 30 mpg.

Most likely, you need to replace your pcv valve, it is probably allowing the oil to get to your intake, cheap fix, no big deal. if its not you may need to replace your intake gaskets, also, check the condition of your oil to be sure it isnt getting antifreeze mixed with it, if it is dont drive it till its fixed or it will cause damage.