Optima does NOT last 6yrs now days. I say 'now days' because Johnson Control has Optima made in Mexico. This has been about 2-3yrs now. Optima's return rate has skyrocketed, quality is absolute junk. I'm a D/C Power Tech and been doing it for 8yrs now. My local Autozone dont recommend them e...
Check the inside exhaust flow, and you'll see that the welds don't match up equally. Buddy bought that same header and we ended up having the grind the inside to flush the pipes with the welds. Also, thin as hell. For $40 it is what it is, Bisimoto ftw.
Bad... Atreyu, just stick to writing your own music and stop fucking up others.