You're scrolling Facebook Marketplace at 1am and there it is — a clean RX-8 R3 for $6,500 with decent paint and an interior that doesn't look like it housed a family of raccoons. You screenshot it. You send it to the group chat. Someone says "bro that's a steal." It's not a steal. It's a ticking clock with a nice body kit. The Renesis 13B is one of the most fascinating engines ever mass-produced, and it will absolutely destroy your finances if you don't walk in knowing exactly what you're getting into. Apex seals don't care about your budget. They wear on their own schedule, and if the previous owner never premixed, never let it warm up properly, never revved it out — congratulations, you just bought someone else's neglected rebuild timeline. Compression test before you even talk price. Not a leakdown — a proper rotary compression test with a Mazda-specific tool. Anything under 6.5 across all faces and you're looking at a paperweight that sounds incredible for about three more month...