Description:

If you have a higher hp engine and chasing what power you can , this is ESSENTIAL  !!!
if you never looked inside these stock horns the castings are TERRIBLE,  to the point ive actually seen spikes coming off the inside walls about 1/4in long and the bends ect are terrible. I widened both ends and removed a MASSIVE amount of material on the inside , I also reshaped the side and bend to help air flow evenly through it...
The bypass valve i adjusted and checked so that it COMPLETELY shuts at rest and the spring still provides strong resistance..
soon as I have my stock horn off I will post comparison pics. I spent hours porting and sanding the inside.  It looks rough but it's actually pretty smooth. I finished the inside off with a final 500 grit wetsand. 
200$ + shipping for ic horn and bypass valve OR 150$ and your stock horn and bpv for a core..
pm or respond to this post.  Paypal is preferred. 
Stay safe N motor on  !!!!!!!