pulling a stock build 440 out of the challenger
will be putting in a nice 426 hemi (alum head,alum rod,590/600 solid roller,tunnel ram,2 inch headers)
car has a 2 1/2 inch 3 chamber flowmaster system now
will that be enuff or do i need to step up to 3 inch(will still be flowmasters)

1970 barracuda convert. 1 of 59
1970 pro street A.A.R. clone (panther pink)
1971 charger
2015 hellcat challenger. Redline red
2014 quad cab 4x4 ram 8 speed hemi