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     We specialize in:  GT500/Cobra-Jet,  '03-'04 Cobra,  SVT Lightning,
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Stiegemeier Porting Services, LLC
2140 S. Old Hwy 94
St. Charles, MO 63303
(636) 949-2275




 
Throttle Body and Plenum Porting
 
Not only can we port and modify your current TB&PL, we also carry the full line of Dragon® 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*

CFM Flow Rate Demonstrated power gain Description of work
878 Stock All stock
976 +10 HP Stock throttle body with welded & ported plenum
991 +12 HP Ported & welded throttle body & plenum
 

Flow testing

* 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

  
   
   
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