Fab fours stubby ( I know fw was spec ) approx $500 shipped , fully powder coated and USA made . Fit is excellent , as is the build quality. Infact we have it on our JL also . Finish has been great against the MI salty winters .
I'm running 38s , 5.13s , fully corrected via tazer . Basically at sea level with trash winter fuel and 20deg temps .
Last two tanks : 50/50 city 45mph /hwy 70mph 13mpg ave .
If I behave on the hwy at 70 I've seen 14.8+15.
All I can add is I ran 37x12.50 stt pro on 17x9 and they seemed to do well at 28 psi cold . Contact was pretty even , stability and ride were really good also . By that knowledge you should be lower with a 40 since it has more volume. Currently running 38x13.50 trail graps at 27 ( but still...
Awe trail cat back exhaust . On the truck for about 250mi and removed . Nothing wrong , no damage , sounded great . Zero drone . It's a bit too loud for her ....
I had a vibrant 18" resonator fitted ( welded ) in place of the small 6" long one the kit comes with in hopes of making the Mrs...