Originally Posted by zhangzeyuandss
Yes. You are right. T304 is the basic and necessary grade for car exhaust. I don't know if this unit is made oversea or not but the seller stated it is made with T304 grade with TIG weld.
" Brand New TOP SPEED PRO-1 2.5" O.D. T304 Stainless Steel 1.8mm Thickness Material Exhaust Middle H-Pipe X-Pipe *** Mandrel Bend Piping + TIG Welding "
I guess it might worth a while to try it out. Since from everything I know, this has the same spec with some of the brands that sold on the forums for thousands..
Again Akrapovic is a different story as the purpose is not only about performance gain but also about weight saving and style.
We have installed tons of top-speed products for people.. Usually they need to be re-fabbed for fitment.
None of their products have even been entirely TIG, only the small portions have been TIG welded (such as 02 bungs, exhaust tips). The piping has for the most part been MIG welded. In most cases too, the steel had magnetic properties, something SS304 should not have. Sometimes, SS304 can become magnetized around the mandrel bend, but its always best to check the straight sections and thats when it became obvious what they were using.
On the E46 cars that would purchase the rear section mufflers, the customer had to go back to a fab shop and have the unit corrected because it did not fit and the tips were very crooked.