Before I start, because this is my first post, I just want to say that this is a great site? I want to upgrade my catalytic converter and muffler. Through all the reading from the site I have decided to go with Magnaflow’* cat. #91006 and muffler #12266. Now the questions I have, because I am getting a little confused are: 1. from what I have read, I will gain on top end speed (?), but lose low end torque. Is that so? 2. I like a nice throaty sound but; will this drown out my sound system? I listened to some of your clips (nice) and read you go back and forth about the sound and which is better etc. I live in NYC, but I take many long trips. Will I want to shoot this car after two hours, i.e. how does it sound on the highway? Oh, I should mention that I made intake mods. already.

Thanks for the info. I will be posting pictures once I am done.

As you mentioned, muffler sound and what is good varies depending on the user. People have wildly different tastes when it comes to what they tolerate or like in a muffler sound.

Did you know that you can buy a stock replacement muffler and you will not outflow it? This allows those who want a new Hi-flow Cat for performance to keep the sound level down.

That is good to know. However, I wished I had read your response before I ordered everything. By the way, where can I get the GM muffler from. My wife has a Buick Regal and I may want to put one on her car.

An original GM replacement can be gotten at the dealer or GMPartsdirect.com (much cheaper), however I recently found an OE Replacement at Rock Auto, fit was perfect. Price was great.

Only thing to keep in mind is that the original muffler was a stainless steel mix that prolongs it'* life. OE replacement is probably a 3 year life.

Bonnilover, can you put your year and trim level in your signature?

Yeah, once I figure out how to do it. I tried once before and it did not work. However, that was during the same weekend the site got hacked. Maybe that'* why it did not happen but, I have a SSE w/ the L27 package.

Head on into profile and under the signature area put your year and model info. Should work. If you have problems pm one of us for assistance

Okay, I updated myprofile. I just received the tips for the exhaust. I went in a little different direction. I going to ovals but, many of the new cars have them. So, I went with Camaro style rectangles, they look nice.