Larger rear tyre? - Royal Enfield Continental GT 650 (centre/center stand, USB ports & heated grips)

This rear tyre:
Avon Roadrider MK II 150/70 R18
Stock rear tyre:
Pirelli 130/70 R18
(Both tubeless tyres with a tube)
Correction:
As @danweston6043 pointed out, these bikes are 47bhp standard, so maybe around 3bhp increase.
Contents:
- 0:00 Showing the larger tyre and describing the difference.
- Accessories:
- 4:42 Sports exhaust
- 4:58 Centre stand
- 5:39 Headlight grill
- 5:43 Windshield
- 6:05 USB charger
- 6:57 Oxford heated grips
- 7:22 Fuel injection modification
- 8:20 Panniers (Royal Enfield)
- Auto cleaners:
- 10:18 Simoniz Wheel Cleaner
- 10:50 Mr.Bling
- 11:45 Engine run, showing the sound of the exhaust.
- Accessories:
- 12:58 Air radiator grill
- 13:06 Dirt plate