Yeah I have the harnesses as well and it has helped. I also bring a cooler of poweraid and food every time but still end up mentally tired. It is better now that I'm more comfortable but as you chase lower and lower numbers you also raise the intensity level. Still no where near as beat up as I used to feel.
02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings & bearings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW race|K&N c.a.i.|Epic race tune|Rouge race pulleys|Seibon CF hood|CSL bumper|ST-40|SR34|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|Apex studs|