5" down pipe?

[aggieLR]

Does anyone make or have a 5" down pipe for a stock turbo? Through work I can get all the pieces to make a 5" exhaust for about $100. It's aluminized 16 guage, and I can cut and weld all the pieces that I want, but I just need someway to connect it. Any ideas?

 

[jwilliams3]

Use a 4" to 5" adapter then weld to it.

www.airflowonline.com

 

[Forrest Nearing]

what do you hope to gain?

 

[aggieLR]

right now, a 5" exhaust, a little louder than stock, but not as loud as a straight pipe, no drone, my own custom built exhaust (sounds cool i guess), and after I decided to pick up something a little more aggressive than the Edge EZ and a bigger turbo, i've already got a bigger exhaust

 

[Got Smoke?]

right now, a 5" exhaust, a little louder than stock, but not as loud as a straight pipe, no drone, my own custom built exhaust (sounds cool i guess), and after I decided to pick up something a little more aggressive than the Edge EZ and a bigger turbo, i've already got a bigger exhaust

You will lose bottom end response if you go to a 5" system. Stay with a 4" you don't need a 5" till you get close to 500HP

 

[Vaughn MacKenzie]

I didn't lose bottom end with a 5" on my '01, but I used a 4" downpipe then used the 4-5" reducer like Jwilliams suggested.



If you use a 5" downpipe you'll loose low end response for sure.



Vaughn

 

[nickleinonen]

I didn't lose bottom end with a 5" on my '01, but I used a 4" downpipe then used the 4-5" reducer like Jwilliams suggested.



If you use a 5" downpipe you'll loose low end response for sure.



Vaughn

diddo... i didn't loose any bottom end when i went to the 5" pipes, but the downpipe is still 4" [with the 3. 5" neck right at the turbo]

 

[aggieLR]

and if you were going to put a resonator in rather than a muffler, where would you put it? Closer to the turbo or closer to the back?

 

[hasselbach]

You will lose bottom end response if you go to a 5" system. Stay with a 4" you don't need a 5" till you get close to 500HP

No he won't. We've down numerous tests with 4 inch and 5 inch exhaust and found no loss in low end torque with the Cummins set up. If the motor was naturally aspirated, you might lose some low end, but once you put the turbo on, it doesn't really matter.



It is incorrectly assumed that 'back pressure' builds low end torque. But it is more complex than simple 'back pressure'. It has to do with the sonic waves within the exhaust pipe, and how they effect cylinder scavenging. Small pipes have stronger reversion pulses and assist in scavenging the cylinder during the exhaust event at low rpms. Whereas the larger pipe has a weaker pulse, and can actually push exhaust back into the cylinder at low rpms. Once you put a turbo in the equation, the pulse effect becomes almost non-existent. (the impeller is in the way and the exhaust port is usually under pressure, but offset by the pressure on the intake side. Non-turbos work a bit different where the mass of the exhaust flow helps pull the intake charge in the cylinder during overlap. )