im doing my own exhaust system. Im a welder, and i want to do a custom mandrel exhaust. is it too big for the back pressure?

 

no its not

 

I didn't lose any low end with my 3" setup, if any I gained low end, just the opposite what I thought would happen. 6th feels a little stronger now below 60mph. I have the Dr. Gas X too so that may help. Get one of those and make your system around it.

Jason