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