Unless your car has a V6 or V8 in it... you don't. Face it, 4-cylinder engines produce less exhaust gases which generate less noise than the larger engines. There is no 'magical muffler' that will make it sound like a V6 or V8.
Depending on other modifications to your engine, you may be able to achieve a sound that is closer to a V6 than a stock inline-4 engine, but real tuners will give up and try to find a sound that is pleasing to their ears instead of pretending to be something that it is not.
With thousands of users on J-body.org, with many different types of modications and engines.. different mufflers will produce different sounds. Meet up with other j-body owners in your region and see what sounds best to you, instead of relying on other people's opinions (everyone has an opinion, you may or may not agree with their point of view!)
