I got a 96 GXE 5 speed The exhaust broke off at the flange that bolts on the exhaust so I took it off yesterday and It broke on Friday. What do you think about it being bad for MPG or better? Is it bad for the valves you think? I would think the cat and headers give off enough back pressure but I do get back fires when I do over 4 grand shifts. I plan on fixing it this weekend when I do an oil change or not if it will help MPG I could care less about HP this car is just a commuter car for me.