I have a 4.8L Silverado. I want to get a single in and single out flowmaster 40 series muffler. I was going to keep the pipes stock. How good would it sound? I don't want anything really loud, I just want to get the rumble. Would this just be a waste of money or not? As for the tip for my exhaust I found an angle cut stainless steel tip 8.5" x 3". Here is the link to it-EXHAUST TIPS Stainless Steel T304 Angle Cut 8.5" X 3" | eBay would this be fine or do I need to buy a $65 tip?