I guess I'll just have to test it out. I generally agree a full length 3.5" system would be freer flowing, but dual 3.5" is way more than I need. You really have to be putting down some serious power levels to even need dual 3". That's 4 digit power territory there. This is why I'm sticking with 2.5. my combo as is will do very good to go north of 475 at the crank.
