Exhaust system. (Ever since I replaced my driveshaft it bothers me.) The damn think is so-o-o heavy! So, I would like to replace it with light pipes from the manifold all the way back(no cats.). The car will get lighter by at least 100lb. Emissions is not a problem for next 2 years. What do you gentlemen think? a) How much gain can I get out of it? b) Will there be any backpressure? c) Any effect on the brain of the car with no cats.? Yan.