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Because BM3 is so affordable it can be a first choice for many people. This increases the number of BM3 cars on the road compared to other tunes.
Imagine dinan was affordable like BM3, everybody would go for that. Then we would see many dinan cars going bang.
The engines are only really safe at stage 1, any more and you're running the risk of rods bending etc due to higher torque output, this doesn't mean the engine can't handle it, just increases risks. Keeping torque down in the tunes will reduce the risks. I'm sure the higher power OTS maps available, are made for people that plan on running alongside forged internals etc. Its down to the user to decide whether they have the supporting mods to make it reliable.
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