I have 4 of the rockford fostgate stage2 speakers in my triglide trying to decide what amp to use, what do you guys recommend? thanks

 

The Rockford Fosgate M5X800.4 is a good choice. I had that with the RF speakers in a previous bike, it was LOUD and super clean. Just lacks good bass.

 

What year was your bike my triglide is a 2016

 

For motorcycle Rockford fosgate is never a good move unless it is the 6x9 lid kit.

 

So, nobody can suggest a good amp?

 

one big enough to blow thone speakers so you will put decent ones in, not much love for the rf speakers.
A soundigital 800.4 evox2 is all you need for those speakers.
If stock headunit is still in play you will need it flashed or a bt355 to fix the nasty preset eq before putting a amp in.

 

what year of triglide and head unit

 

2016 factory radio