BANKS 4" S/S EXHAUST SYSTEM WITH 5" TIP
I've had the Banks 4" S/S exhaust system on mine since Dec 02'. Believe me, I was very concerned about all the opinions on good and bad systems. Especially dronning. I was afraid of a poor fit and ease of installation too. I have no complaints whatsoever. No resonating, dronning or anything negative. The Banks system is a good improvement, both in sound and performance. Your signature does not indicate if you have an automatic or stick shift. If yours is a stick, an exhaust brake is the "absolute greatest thing" to add when you do the 4" exhaust.

I also chose the 4" exhaust brake, so my Banks system is as close as I can get to having a real/true 4" system (with a 5" tip)

Everything from the backside of the turbo to the 5" tip, fit like a "glove".
There are several manufacturers that can meet your needs regarding an exhaust system or exhaust brake. I would highly recommend not buying on price only. The nightmare of saving a few bucks and living with a lousy exhaust system is not to your advantage. Review a few members thoughts on the TDR search option. Then the choice is yours. It would be worth your time to see/hear the exact system you want, before you buy it. That's what I did.
My response to your post is only to express my satisfaction with my Banks system. It was real easy for this old dog to install too. I found the price was not the "cheapest" but as a package, I found the price inline with what was else was available. My only recommendation is to install it yourself. I was able to get a really good price by purchasing my system directly from the manufacturer.

Jim