Within the first year of me passing my test (aged 20) I remapped my L series ZR - I told them it went from 115bhp (my mind could be foggy on that) to 150bhp. It made no difference.
If the OP is having issues getting cover, I'd suggest trying a modified car insurance broker such as Adrian Flux. They'd more than likely find the new power output negligible and it shouldn't impact the premium.
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