1 1/2" gained in head room if you leave the OEM alignment pin on the seat track mounting rail and use the middle locking nut. The seat angle is better after droping the rear of the seat and appears to make up for a poor lumbar support on the srt6 seat. I can take a picture of the driver seat compared to the passanger seat if that will help visualize 1 1/2".

This morning's ride was definately more comfortable and my opinion is that is was worth drilling two holes in the floor pan.