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In Reply to: One quick ???? posted by ///M-COZMIC on March 17, 2002 at 21:34:09:
The HFM takes a sampling of the air flowing through the intake and adjusts the engine management software accordingly. Because the stock software doesn't know its a 3.5" it assumes that it is the 2.5". More air is actually going through the intake than the software expects.
You should see a dramatic improvement once you get the conforti software. I agree the sound alone is worth the install.
Good Luck!
98 M3 Coupe