Extreme Power, Extreme Scream

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     We specialize in:  GT500,  '03-'04 Cobra,  SVT Lightning,
           Plus Jaguar,  Cobalt/Ion,  Mini-Cooper,  and more
Dragon Throttle Body & Plenum
   
 
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Stiegemeier Porting Services, LLC
2140 S. Old Hwy 94
St. Charles, MO 63303
(636) 949-2275


** IMPORTANT WARRANTY INFORMATION

Supercharger Porting & Front Drive Rebuilds:
WARRANTY. One (1) Year on parts and labor. Excludes parts and materials not supplied by Stiegemeier Porting Services, LLC and/or labor performed by a third party. Warranty void if Front-Drive or Supercharger is further modified after leaving our facilities. Installation is the sole responsibility of the owner. Improper installation or modification voids warranty.
 
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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