KA-T less power in S13

[Boostin240sx]

I had a 97' S14 with a KA-T in it tuned with a SAFC running 9 lbs with a T3/T4 and 370cc injectors. Due to an event at the track the car was scrapped and I transferred the motor and turbo setup to a 91' coupe. Same tune and getting similar A/F numbers as in the old car. It is not making near the power it did in the S14. I did use the S13 intake manifold to put it in the car and neither car has/ had a Z32 MAF. Timing on both cars are/ were 20 deg BTDC. I have been driving the car to work 4 days a week with the turbo setup for almost 6 months (knock on wood) and no problems except lack of power it had before.

Any suggestions on the reason for it?

[LayNLow]

S13 intake manifold has swirl control valves which do hinder airflow. Might want to try swapping upper intake manifolds with a S14. It is a direct bolt on as long as you use a tb/sensors(which are on the lower intake manifold anyways) for your harness.

[Boostin240sx]

Would it make that significant of a difference?