Photo’s of Our Work:

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Not only can we port and modify your current TB&PL,
we also carry the full line of BBK® throttle bodies and plenums.

Throttle body and plenum modifications should not be taken lightly. Air flow restriction in this area will limit HP potential. Stiegemeier offers port-matching to fully welded and enlarged plenums to deliver all the CFM your throttle body has to offer.

**Please Note: OEM throttle bodies have the best driveability! After-market single-blade types will almost always improve HP and TQ but usually demand attention from an experienced tuner.

 

03′ & 04′ Cobra porting bench flow data

* All bench flow data was measured on a Super Flow SF 600.
Bench flow data was measured @ 10″ of pressure, final numbers were converted to 28″ data via pressure conversion constant of 1.67.
Example of converting 10″ data into 28″ data: (593.5 cfm x 1.67) = 991 cfm

CFM Flow,                        Demonstrated Power Gain               Description of Work


          878 CFM                                                                                 Stock,                                                           All Stock                     

  Stage 7    1001 CFM                                                               +15 HP                                                        Portem OEM TB

          Stage 8    1150 CFM                                                               +25 HP                                            Welded PI + Ported OEM TB

     Stage 8+  1250 CFM                                                               +35 HP                                                Welded PI + 65mm TB