i already have long tube headers on the motor and scraped and threw sparks everywhere i went until i jacked up the torsion bars, and even now if i hit a pothole or dip in the road (which is 90% of the roads here) i still scrape bottom.
So either you’re not using Doug’s or TTI headers, or something is seriously wrong with your suspension. Or maybe both.
I run Doug’s headers on the 340 in my Duster, my car is lowered about 2” compared to the factory ride height, and I don’t have any issues with my headers bottoming out while I’m out on the road. I even compared the TTI shorties and head pipes to my Doug’s long tubes, the improvement in ground clearance was less than 3/8”.