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Discussion Starter #1
I dynoed my 550 before and after installing Tubi exhaust (the straight thru flavor) and lost about 10 hp and 10 #'s torque. I noticed the air fuel ratio was slightly leaner throughout the rpm range.

Does anyone know how to reprogram the ecm to add the fuel back in?

Regards,

Paul
 

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Sorry, one last thing, I got way ahread of myself. WELCOME TO THE SITE :) If you get the chip please let us know how it re-dynos and if they give you a graph post it. We have some 360 graphs and a 328 graph so a 550 would be nice too.

Cheers,
Andrew
 

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Discussion Starter #6
Thanks for the info. My car is a 2001, SN 126803 . I believe it is either the last or the second to last 550 produced.

Paul
 
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