Originally Posted by xs2man
I wouldn't worry about making power with a filter, its just unlikely to happen. Have a look at these 2 videos:
Ok. Its almost 20 mins of your time, but you will realise that its ALL for the noise, and maybe a small reduction in power.
I'm only really doing for the noise, and the rumble/ burble which is unbelievable compared to stock.
However, would rather not be losing power!