The mileage is not so much the case for reserve, it is the amount of vibration that the systems incurs during usage. Clamp it down good and snug and make good welds and it should be fine. I plan to see some more mileage and running this season if all goes to plan.
You also can not lose with an SS system. It is also light compared to steel tubing. The wafer thin SS tubes makes for more of a ratty treble sound where as the aluminum brings more of a bass and humbler sound.
Will give you weights later today. Got caught up talking up a shop storm with Hemi-itis tonight about his project.