Over the years Ive heard and experienced mixed thoughts on exhaust, mainly running straight. The other day I took my 50 cad to a car show and back......by the time I got back I had a bitching headache and it lasted the entire day, and my blood pressure was high. I believe it was CO2 poisoning from my leaky exhaust, and leaky valve covers smokin. So I said enough is enough I gotta fix this stuff. The exhaust is all rusted heavily, not exactly worth welding on. Me being the cheap bastard I am, Im thinking of sawzalling off the exhaust where its mainly bad (before the muffler) and getting some cheap exhaust pipe and clamps from autozone and running it out back. Ive heard straight exhaust can burn valves? Is that true? I also know from experience that some cars do better with a little back pressure for whatever odd reason. My old mustang (98) I used to run straight pipes for a little while and when I put in a catted midpipe it was quieter but seemed to pull better. Thoughts?