exhaust alternative

Hey guys, I am going to build custom exhaust headers, and after a bit of studying I am considering my options. Stock headers are 38mm outside diameter, and they are double pipes so i think inside diameter is around 35mm for example. If I build custom headers from 43mm pipe with thicknes 1.5mm...

Was digging around for alternatives and ran across Flowtech's Red Hots Glass Pack mufflers. I know I would have to compensate for the back pressure change if installed, but I was wondering if anyone here had any experience in attempting this option. I'm always open to new ideas, but I don't...