Yes it makes a major difference on our autos and you will notice a huge improvement also when you install the header(= it makes a even bigger difference than a tune, intake, and exhaust combined!
2 Sundown X10's in 2.5cuft Net tuned to 31.65hz
SKAR SK-1500.1d, SKAR SK-85.4
Lots of Audio Technix 0 gauge
XS Power 1200,XS Power 3400d
I murder lowssss