In Reply to: Roundel last month says Chips do krap for your HP/ posted by (more...) on February 09, 2000 at 22:39:14:
They do work. I had my car dynoed a few weeks ago. I saw ~218 at the rear wheels! The car is a '99 M3/2 and the software is JimC OBDII upgrade.
The red line was with the stock intake with the baffle and the snorkle removed. The green line was with the whole intake/MAF removed...just the short little tube coming out of the throttle body. Wayne Miller also dynoed his car w/ JimC intake and had the same power figures as mine with the intake removed, etc. Of course, there are differences from car to car, but there were probably more gains to be had from my car with the JimC intake since it smoothes out the airflow.
BTW, ignore spurious data with the red line....something weird happened there.