I personally don't think that you will gain very much by switching to true duals. I know that on my daily driven 4th generation ls1 equiped camaro I went from stock to cat-back to intake/headers/heads/cam/cat-back to true duals. The reason that I went true duals was everyone told me that my car would make more power with the free flowing exhaust. I put the car on a dyno after the head cam swap and then again after the true duals were put on and sadly I was not awarded by very much. I don’t think the minimal gains were worth the cost of the true duals. Just my opinion though.