I just today put on a 3" downpipe and 3" magnaflow with a turndown and wow the car feels completely differen't the top end feels about twice as fast, lol. However the car resonates because of the turndown and is a bit deafening while cruising. How restrictive would it be If I added a 2.5" mandrel bent pipe from the magnaflow to the back of the bumper, basically a 5.0 drivers side rear pipe that goes over the axle and out the back. Would the power loss be significantly noticable?