By What is standard exhaust pipe diameter?
Choosing the right exhaust system size
| Engine CID | Single System | Dual System |
|---|---|---|
| 350-400 | 3″ (76mm) 3.5″ (90mm) 3.5″ (90mm) | 2.5″ (64mm) 2.5″ (64mm) 2.5″ (64mm) |
| 400-450 | 3.5″ (90mm) 4″ (101mm) 4″ (101mm) | 2.5″ (64mm) 3″ (76mm) 3″ (76mm) |
| 450-500 | 4.5″ (115mm) 4.5″ (115mm) 4.5″ (115mm) | 3.5″ (90mm) 3.5″ (90mm) 3.5″ (90mm) |
Does exhaust diameter make a difference?
“A common misconception is that the larger the diameter the better the system. But, bigger isn’t always better. Smaller diameter pipes will usually produce better low- to mid-rpm torque. Larger diameter pipes usually produce more mid- to high-rpm torque.”
Can an exhaust be too small?
When your engine works at the top of its power band, it creates a lot of spent exhaust gases. And if the exhaust pipe diameter is too small and it generates too much back pressure, these exhaust gases will be heavily restricted from exiting the engine. Engine power and performance will be reduced.
Is a bigger exhaust pipe better?
Exhaust pipes are made bigger to allow better exhaust flow. This is important for increased performance and horsepower (not for the sound). Instead, aftermarket exhaust also equips a less restrictive muffler – which is responsible for the much louder sound.
Can exhaust be too big?
Yes, it is possible for exhaust piping to be too large. When the pipe diameter increases, the exhaust gas velocity decreases and can be detrimental to engine performance. As you are aware, another drawback of tubing that is too large, is increased noise.
Is 2.5 or 3 inch exhaust better?
yes 3″ probably better, but might be hard to run all the way to the back next to the tank, if your using the smaller TTi headers i don’t think the 3″ would give much more HP, you could also go 3″ to the muffler and 2.5″ out the back.
Is 4 inch exhaust too big?
This means that an extremely large exhaust pipe will actually cause SLOWER exhaust flow, and decreased performance. The general rule of thumb for exhaust systems is, as we said 3-3.5in for 250-350whp, above that 4″ exhaust is the right size, but that’s about as big as you want to go, even at the 400whp-500whp level.
Are bigger exhaust pipes louder?
If you are too lazy for the details, bigger exhaust pipes do make the exhaust louder – but only by a little. Exhaust pipes are made bigger to allow better exhaust flow. Instead, aftermarket exhaust also equips a less restrictive muffler – which is responsible for the much louder sound.