Trukfit

i will be driving my moms older 1997 Lexus sc300 with about 225k miles some information and a dice tips etc. Ok well it runs pretty good 1st off the speedometer doesn't work and I need to get either a new muffler/exhaust it has a hole in it as I've been told advice ?? And um like what parts could. Buy as an upgrade sense it is 1997 like water pump new ac condenser just your average replacement parts to make a better ride and also when I put it in drive from reversing it has a little jump In it ??? The anteanna doesnt come up either it makes a really annoying sound when it attempts to come up and down, the trunk out too .