And keep in mind that a 3" muffler will be louder than the same model in a 2.5".Sorry for resurfacing the old thread; but I'm getting ready to buy mufflers to replace the Flowmasters on my car as they're just too loud though sure...they sound great; but after 2 years the novelty has worn off. My '63 has headers and 3" pipes (too damn big for my motor but was talked into it w/o my doing more research). And looking at muffler selections it's like looking at a menu in a Greek restaurant...man. I'd still like a nice sound. After sifting through the posts here it seems that Accurate or ECS is liked for their sound and not too loud. Well, asking since you have experience with these two types of mufflers, you have any preferences one vs the other? Thanks.