stopping roof flex

[kykendall54 10+ year member]

I have a do sp4 reconed by psi. It's fully upgraded to 3000 rms. I've got a saz 3500 pushing it. The box is up firing and I have so much roof flex. What are a few ways to stop flexing? I can hear a poping sound in the roof. I know thats brace is probably the best thing to do but I'd like to avoid that if possible. Just trying to get some thoughts on what I can do to reinforce the roof. Thanks

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[Sleeklsc 5,000+ posts]

Drop the headliner and put some deadner on it, and while its down fill the area between the roof and factory braces with some expanding foam.

 

[kykendall54 10+ year member]

Thanks, ill pick up some dynamat then here soon, any idea of how much ill need? I have a chevy silverado 1500 crew cab. and what kind of expanding foam? any brand or kind you'd recommend?