yeah how much? I'm gonna be putting on LT's when I do the head swap and so far my choices are Bassani, SLP or BBK. Whichever ones offer the best Priceerformance ratio will be going on my car.
Long tubes do not kill low end torque. In fact they are better for low end torque because of the long tubes. Just like in an intake manifold where long runners help low end torque by keeping velocities up. When long tubes kill torque is when the tubes are too large in diameter. The 1 5/8" primaries on the SLP headers is about the right size for the 4.6.