Has anyone heard of them bending or warping under heat or over time?

 

RichardCh,
Unfortunately, nothing sounds like a Ferrari. Or fortunately nothing sounds like a Ferrari if you are Ferrari owner. I don't know if adding headers will make it sound any different. If so, I imagine the difference will be minor.

 

I went thru (what I now consider unnecessary) the trouble and expense of installing a set of ported and polished GT2 headers sometime after I had put in the Europipe exhaust...and I can say that the headers did change the tone of the exhaust. It made it deeper along with a little more resonance...actually a bit loud for me. I cant' say that I notice much difference in the performance....just the deeper sound. I'm looking for a four wheel dyno around here to check the performance levels.