DexterPunk wrote:The aim with flashing back, would be to avoid any warranty issues.
Well, I reckon if they see an aftermarket header, it's obvious you'd have a tune...and they can tell if they look. So if a tune voids warranty, you maybe best staying off a header (as it's a very telling sign).
p.s. I've had the car in for warranty since the whole thing, when I hit a curb. Nobody cared about the aftermarket parts nor the tune. I've even told them not to mess with the ECU in any case, as it has a special tune on.