k im Ive got all my parts for my upgrade and all im missing is the injectors... so far ive got the 90MAF,SVT pump,Chicane ripp kit,chicane pulley...nowI know 42lb's are what I need but how would 39lb'ers work?... I friend is upgradin his 03 cobras to 60lbs so he wants ot know if id like them?..Now Im just not sure if it will work fine with my setup or should I go 42's...I still have yet to hear anyone use the 39's ..everyone does the 42's.