Lengthing the intake increases the torque of the motor to some extent. If it is like a phenolic spacer and made of plastic or some type of heat resisting material, That gains could be more, mostly from keeping the intake cooler. Pair up a phenolic spacer on the upper to lower intakes and a TB spacer and add some torque, of course if you have 3" exhaust or duals it won't be noticeable. If you keep a longer thinner stock exhaust tubing and add the spacers you will feel a difference.