I would buy a name brand bolt on cat back system. They should all give you the sound you want, 87 octane for general driving, 91 when towing my boat, try and avoid ethanol, K&N does make a good CAI but doubt you will utilize the few horsepower gains unless you are wide open throttle a lot. Congrats on the new rig, they are like nothing else.

 

The K&N one for the H2 is junk - turns your factory cold air intake into a hot air intake since it ends up pulling a lot of air from the engine compartment from all of the gaps it leaves.

 

Vouch. H2s intake system is actually pretty fantastic. Massive filter to let high volumes of air through, big piping and goes straight out the side of the hood.

 

I would start off with how much do you want to spend on a H2? Out of that 5K for repairs/Upgrades. Can add up really quick…

 

On the road to 1 million miles.