BMW E90 N53 325i DCE Parts Catless Headers with the PSR Parts Stage 1 Remap and xHP3 Remap for much more aggressive Upshifts and Downshifts. The BMW N53 feels completely different with the xHP3 map, the slow upshifts are now much shorter, making the car sounds nicer as well.
We set up the M-Mode in the most aggressive upshift and the most aggressive downshift modes to test out the feel of the gearbox. We also modified the Shift Maps with the D-Mode in the Neutral settings for a comfortable ride and the S-Mode in Relaxed for an earlier upshift, but with a more aggressive character than D-Mode.
Because the N53 is a naturally aspirated engine with not huge amounts of torque, we did not remove the kickdown option in M-Mode so the driver is always able to get the most out of the engine even when cruising in 6th gear.
We also remapped a soft Burble map into the car for added sound as the N53 is quite clinical with it's overrun.
Before and after sound clips:
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Parts:
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