I'm starting to see these 4" Moto-Blue exhaust systems on the internet for cheap about $230 shipped. Are they any good, cause drone or any other bad things. Thanks.

 

I've got their 4" dual system on my pickup. I've had it on for about 6 months. I get drone at about 2100-2300, but mine is straight piped. The kit comes with enough pipe to leave out the muffler if you want. I'd say it's a good kit.

 

I have the 4" single with muffler, works good.