i saw that they milled the deck .018 and you wanted to run .040 gaskets. did you measure how far your piston was above the deck? if you're running a .040 gasket you may be running it pretty tight on quench space.

 

.007 piston above deck.

2 1/2 or 3 inch exhaust? y and split or true duals?

 

3" dual.

 

X or H and what mufflers to keep drone and not be so loud I wake the dead?

 

H or X is personal preference. they will all drone, but i would think a large magnaflow muffler would do the trick. they have some large mufflers with the x built into it.

 

12599 magnaflow?

 

i think that's the one i run on my HD. it sounds great, but it still has factory manifolds and converters. if it's too loud or raspy, just add long bullets into the I pipes before the muffler.

 

nope, mine is a bigger version of this. but here is some sound clips of that muffler run through a 402.

https://www.performancetrucks.net/fo...xhaust-524476/

 

this is what I'm running and its a great muffler. Truck has dual 3", 1.75" LTs, no cats. It's definitely loud, but far from what I would call obnoxiously loud.

I had to add 2x Helmholtz 30" resonators to kill the drone, and its pretty quiet at cruising speeds now.

 

Any sound clips by chance?