Are they any good because I've never heard of them. I work with someone who just bought a GT and it had Warlock Cat-Back installed on it already. I haven't heard it just yet and this guy knows almost nothing when it comes to modding. I thought he was screwing with me when he told me what he has.
Really deep, aggressive tone. Just the 5.0 with Warlocks sounded louder than my '03 with full exhaust. Only bad thing is they rusted out with 3 holes within 2 years. They have ZERO coating on them. I will probably by another set when I get my L/T's and Prochamber put on my 5.0, but I will probably at least paint them and try to high temp seal them to keep them around a little longer.
If you think Flowmasters drone loudly, do not get these mufflers!!! They are like Flows on Steroids when it comes to the drone with the baffles out.