Aftermarket Runner Length and Port Diameter Variations

Q: What are the different runner lenghts and port diameters for the different aftermarket TPI runners and bases?

Runner Type

Length (in.)

Port (in.)

Stock TPI

7.250

1.470 round

Lingenfelter/Accel

6.625

1.615 round

SLP cast runners

6.625

1.600 round

TPIS large tube

7.625

1.660 round

TPIS siamese large tube

7.625

1.660 round

Lingenfelter/Accel Super Ram*

4.125

1.870×1.970 "D" shape

TPIS Mini Ram

3.500

2.600×1.350 entry

1.960×1.200 exit

Stock TPI Manifold base

6.375

1.470 round entry

1.960×1.200 exit

TPIS Big Mouth base

6.125

1.750 round entry

2.090×1.280 exit

Lingenfelter/Accel

6.125

1.750 round entry

Super Ram base

2.090×1.280 exit

* Runners only