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any 100w ones really.
give out much more light but don't worry about them being illegal 'cos they're still no where near the brightness of modern day headlights/xenons etc. so no copper would ever notice.....
mine only gave me 1/2bhp and the same torque increase at peak but throughout the rev range was a constant 5bhp higher and peaking 300rpm lower, so although I was initially not impressed at the 'gains' as soon as I got it out on the road I knew there was a very nice improvement....
My Viper IK makes a bit of noise but you can really only hear it from outside. Inside you can only hear the exhaust lol!
It's made a noticable difference in power to mine.....