i have a 97 mustang gt and when i bought it it had lm1 with an off road h pipe. with the off road h it sounded good but it was just to ridiciously loud and the car was running like sh**. now im running the stock midpipe and its just to quite. i was thinking going with the slp catted x does anyone have this how loud is it compared to the off road midpipe. and is it going to change how the car runs at all.