300XS Attenuator Top hole size

[savage]

Don’t know it but just had to poke fire.

Attunator signals are just as important as carb signals they play with the map sensor.

Its mor more of a heat shield though.

Around 100mm

Yep the hole size is very important thanks for your reply.....Can't believe Mercury wants around $160 dollars for the attenuator. I can cut the hole out with my water jet in about 5-8 seconds and keep the $160 bucks in my pocket.....I'm definitely not a "cheap azz", just smart about spending money on the right things.