I decided to re-do mine (after 5 years of pounding the sidepipes onto speedbumps...)
This was done is SS304. Sure the linear expansion is a wee bit more, yet the thermal conductivity is nearly 1/3... Plus it dont rust and it looks cool.
Material Properties Mild Steel-1010 SS304
Tensile Strength lb/in2 (70 F) 55,000 85,000
Yield Strength lb/in2 (70 F) 40,000 35,000
Elongation percent 20 55
Density lb/in2 0.283 0.29
Modulus of Elasticity x 106 lb/in2 29.5 28
Coefficient of Thermal Expansion in/in-F x 106 (70'F) 7.228 9.9
Coefficient of Thermal Conductivity BTU/ft-hr-F (70'F) 26.98 9.4
Before:
After:
Sounds great at idle, not toooo loud. BUt open it up, and "OH MY GAWD" loud.
Oh well, good thing I'll be wearing a helmet and earplugs most of the time...
