1. Tyres. Yes! As simple as Tyres!
2. Reduce weight.
Initially cheap, then escalates in price for marginal gains. Ie: lose the radio and spare, lots of weight reduced for near zero cost. Then reduce weight by swapping parts for carbon fibre etc, all the way down to the valve covers. See, big dollars, for grams saved. It's endless.
Then....
3. Aero (drag vs down-force) - so hop down to Bunnings, grab yourself some plyboard, screws and lots of tape... Have fun!
https://grassrootsmotorsports.com/fo...d/39702/page1/
Enjoy
