Crome is the cheapest, and works well.

Neptune is best for the money.

The rest cost too much for what you get.

 

Crome worked for me. 300whp on stock internals. And it's been two years of riding it off the rev limiter and melting the tires so, if it was going to blow I think it would have already happened. 100 for the chip and 100 an hour to tune.