I am from the Northern Territory and have next to no experience with Petrol cars besides servicing My cars is a 2008 WM Caprice with a stock L98 with what I believe is aftermarket LPG setup installed but decommissioned. I’m looking for some advice and guidance on upgrades specific to highway driving Also things maintenance wise to look out for or fix now. I wish to set a budget to save to for the upgrades. I wanted to cam it but with economy in mind. OTR and under drive balancer kit. Headers and exhaust which stock already sounds good to me but looks a bit dented. Any input would be greatly appreciated thanks.