Quote:
Originally posted by lstpierr
If you improved the intake, and the exhaust, how could you possibly lose HP or TQ?
I would think you would stand to gain in both areas?
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The Mach motor as programmed from the factory MCU is rich (safe)...adding a CAI tends to lean it out..thus you gain a bit of HP/T...but by adding further a CAT Back..it leans it out further..so depending on how rich your system was in the first place..the lean condition created by adding the CAT Back may put you in a power loss situation until you can restore a better A/F ratio....YMMV..