Not 100% convinced of my design. I just saw a 3.5 xpipe setup so started wondering. Found the correct reducer to get to 3". Sure its an old debate of x vs h but really up for any options that just ends with a pair of good mufflers.Do you need a X?
If so yea and spray 400 hp .
So are you saying from experience that dual 2.5" will not be a restriction on a 650hp Small block? If so, do you think it would be better if the headers were also made with 2.5" collectors?
You have been saying this on every forum you belong to for years. I would love see the data that backs your claims up.