I dont care on the cost as such.
What I do is build cars to a stage where its still a LOT cheaper than buying a different but standard (or different, but modded) car of the same performance.
Dont understand the people who spend twice Cossie money on their RST just to get it as quick as a 270bhp Saff Cossie.
Or the same sorta thing with these 24 valvers, ahem... Jim, JonnyB, etc etc.
Dont mod cars cause I wanna, and dont give a flying fuck about being the fastest type of whatever car, do it cause its the CHEAPEST way to get the performance I want.