weatherlight
Guest
If you dont want to risk warranty your best bet will still be to lighten up the car and get low rolling resistance tires mate. If you already have RRL, no spare wheel and light carpet mats, there isnt much you can do though . 15" lightweight alloy or steel wheels offered around %2 savings in a test done with golf mk6 compared to 16" alloy (195/65 15 vs 205/55 16). If you dont have LRR tires you may consider both the wheel and tires for up to %6-7 performance gains (although engine output will remain the same, you will gain 6-7 hp at wheels on a dyno, you can test it and power at the wheels is the real deal)
Since your main concern is performance, cost of wheels + tires is probably logical for a 6-7 hp upgrade
Since your main concern is performance, cost of wheels + tires is probably logical for a 6-7 hp upgrade