January 16, 2010Can someone explain the pros and cons of the different pipe sizes for exhaust systems. My understanding is that the smaller the pipe is ( like(2in) the louder and more high pitched the sound will be, and the bigger the pipe like (2.5) the deeper the sound is.
Subscribers : SwampG8tor02
January 16, 2010yeah for the most part what are you trying to figgure out?
January 17, 2010Swamp, yes, you are correct in that a smaller pipe will tend to have a higher pitch sound to it while a larger diameter pipe will have a deeper sound. But, you also need to take into consideration that a larger diameter pipe has less flow restriction for a given amount of gas flowing through it. Would you rather fill a swimming pool from a fire hydrant using a 2.5" fire hose or a 1" garden hose? Same idea. The starting pressure is the same, the end pressure is the same, but the hose will limit what can flow. So, now you are thinking that a larger diameter exhaust pipe is better. NOT NECESSARILY!!!!! A larger diameter pipe is good for high RPM power (over say 4,000 rpm), but kills low end torque (torque is what gets your truck moving, especially with heavy loads). So, what are you after, drag strip power or low end grunt for work. Most people fall in between. So, it is a compromise between gaining power and keeping the low end torque.
I didn`t see what size motor that you had in your truck. For the 300-400 ci (ie, 5.4L, 4.6L, 351, etc) going with a true dual (ie, 2 pipes all the way back from the motor to the rear bumper) setup using 2.5" pipe is about the biggest that you want to go. That seems to offer a good balance between power and torque. For the same setup, if you are using a single pipe, a 3" pipe is "ideal". if you have say an I-6 motor, then dropping back to a single 2.5" pipe would be where you want. You start looking at hte 460 ci motor and that is where going with say dual 3" pipes will be more advantageous.
If you have a diesel engine, well, then all this goes out to lunch. Diesels operate on a different principle and have a different basis behind what is best.
Hopefully this answers your questions.