Which pipe give out more horsepower big gun or yoshimura and by how much?

 

yoshi by 2hp. Big guns are LOUD

 

Yosh but it wont give you the most.

EDIT
It will give you the most out of them two, but not the most out of all the pipes out there.

 

I had a Big gun slip on, with the race core it was loud and made a bit more top end than stock but couldnt take one in a short drag. With a quiet core it had less power than stock. It was sold quickly. No experience with the Yosh, but I'd avoid the Big Gun personally. The complete system may be better but I was very unimpressed with the performance of the slip on.