The regal? That must be one hell of a K&N!
LS4 intake manifold and stock cast steel exhaust manifolds still?
If so, that's not bad really. Factory tunes leave alot on the table.
It added 130hp in just under 5 minutesThe regal? That must be one hell of a K&N!
I would doubt 325 highly at most you will see on stock intake and exhaust manifolds are 310whp. Still not bad. My cam gxp is putting down 347whp