Modern turbo diesels (VAG 2.0 TDI, BMW N47/B47, Ford 2.0 TDCi) and turbo petrols (VAG 2.0 TSI, BMW B58) deliver the biggest reliable gains.
Some platforms tune brilliantly. Others give you barely anything. Here's where the money goes furthest.
What about my N/A petrol Civic? — Honest answer — not worth it. Gains are usually 5-8 bhp for £400. Skip it.
Is my hybrid worth remapping? — Usually no — the electronics and battery management make it complex with minimal real-world benefit.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].