Quote:
Originally Posted by dradernh
I found this from Steve Dinan at Carbahn regarding his Stage 1 M340i/M440i B58 tune:
"A note on down pipes (removing the catalyst). We have run back-to-back dyno runs with the cat on and off and the power gain is much smaller than most people claim usually around 11hp."
The tune produces "93 Octane: 471 Flywheel HP & 495 lb-ft Flywheel torque". I'm not sure many drivers would notice an 11 HP increase at that level.
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11 hp without any changes is a significant difference. Once you run a map that takes advantage of the higher flow, you will double the gains.
Upgrade your fueling or your turbo, and you will triple the gains.
These are excellent numbers; Steve Dinan knows it as he is a good tuner. But he is also an even better salesman
