The car is basically stock. Only mods are K&N filter unit and a Clutchmaster Stage 3 clutch. All allowable in GS.
As for the seat question.
A lot of it is seating position. For me, the stock seats are great for most applications, but on courses where I am really busy in the cockpit, I do slide a bit, but not much.
I've always been taught that your seat should be close enough to the wheel where when you sit you can extend your arms to the point where they are slightly bent with your wrists (base of your hand) resting on top of the steering wheel.
Legs should be close enough where your knees are slightly bent, but not touching the bottom of the dash.
Seat back angle should only be enough to take the stress off of your shoulders.
That's the position that I use and it seems to work well. I am less fatigued during regular driving and in AX. The side bolsters on the stock seats seem to hold pretty well using this.
FORMER Avenging Moderator of the Apocalypse and Leader of the Axis of Oversteer
"I live with fear every day and sometimes, she lets me race."
2002 SVT Focus... Stock