I would like to improve my horsepower and efficiency by swapping my stock muffler for a better model and also completing the CAI modification posted on this website in the Tech Articles section.

I do not know a lot about exhaust - other than straightening the airflow improves performance.

My question: which muffler is best for improving performance, but is not too loud. I need it to sound like a normal truck unless I put my foot into it - then I would not mind if it had a slight growl. Trying to keep the nieghbors happy.

I have a limited budget - that is why I am not replacing the entire exhaust system at this time (can't afford headers or new pipes).

Thought I would start with CAI modification and a performance muffler.

Any tips are much appreciated.

 

I'd say from what you're looking for a 22" magnaflow would be good for you. It's a straight through design which is better for exhaust flow and it is almost as quite as stock.

I think its the 22" or might be 20", I can't really remember right now but really anything over 20" will be quite.

 

^ Yup

 

Somebody tried to tell me a straight through design will damage the valves. Any truth to that? He said you need SOME back pressure, but not as much as a stock exhaust supplies. Thanks for taking the time to respond.

 

That "someone" is an idiot and needs some sense beaten into him. If someone ever uses the term "back-pressure" in a serious conversation, you now have the right to insult and ridicule them.

 

x2, backpressure is the hillbilly mechanics advice. The truth about backpressure is it is what you feel when you are coasting in a gear ( commonly heard in manual trans ) and you hear the exhaust rumble up while your slowing down, backpressure effect kicks in and it helps slow down the vehicle, but it is not good for the engine. use your brakes to limit this to a very low limitation.

Velocity, static pressure, and scavenging in true dual applications, are what help an exhaust perform to its peak. The more free flow, the better, but with the proper pipe size for torque to remain well.

 

^ Well said you two!