Best Performance Upgrades for Little Money - Here's My Vote

on a budget?

trade that old mopar for a chevy...aftermarket parts for those dime a dozen cars are, well, a dime a dozen

[flamesuit on]

unfortunately for the Mopar crowd this is true.
You can build or buy a chevy sm. blk for pennies compared to Most mopar small block builds.
Easily the most popular and plentiful performance build in the world.The 100 millionth sm block
chevy rolled off the assembly line some time in 2012.

as for cheap performance upgrade..no such thing.