Exhaust question
4th Gear
Joined: Jul 2004
Posts: 4,354
RE: Exhaust question
On the B5, I believe it is 1.75 inches. Borla is 2.25 inches.
For those of you who remember your rheology, the resistance of a tube is related to the 3rd power of the radius. That means that small differences in radius have huge effects on resistance.
For those of you who remember your rheology, the resistance of a tube is related to the 3rd power of the radius. That means that small differences in radius have huge effects on resistance.
1st Gear
Joined: Oct 2006
Posts: 426
From:
RE: Exhaust question
ORIGINAL: david9999
On the B5, I believe it is 1.75 inches. Borla is 2.25 inches.
For those of you who remember your rheology, the resistance of a tube is related to the 3rd power of the radius. That means that small differences in radius have huge effects on resistance.
On the B5, I believe it is 1.75 inches. Borla is 2.25 inches.
For those of you who remember your rheology, the resistance of a tube is related to the 3rd power of the radius. That means that small differences in radius have huge effects on resistance.
Senior Member
Joined: May 2006
Posts: 491
From:
RE: Exhaust question
I didn't find what A4 you had but I read elsewhere running a 2.5" to dual 2.25" was a good setup for a B6. I also tried finding the diameter for a B6 (quattro manual) Borla exhaust on their site but the closest I came was the installation instructions showing a 2" clamp. I swear it's a 2.25" like david9999 says on the B5 but don't know. If it isn't, I'm going with the Neuspeed 60mm (~2.36").
Here's an interesting excerpt from overboost.com:
I would have to say "small turbo" = K03, our stock turbo. If you plan to go BT, perhaps a 2.5" minimum diameter is wise?
Here's an interesting excerpt from overboost.com:
Turbo cars typically have a larger number of exhausts to choose from, allowing you to pick an exhaust with a pipe diameter that best matches your turbo combination. Usually, cars making under 280 horsepower will use 60-millimeter piping, cars 280-350 horsepower will use 70-millimeter piping, and cars 350 horsepower and over will using 75-millimeter piping and larger. Of course, that's just a rough guideline because some cars will "like" larger pipes and some will like smaller pipes. For instance, cars with small turbos will also prefer a smaller pipe, no more than 60-millimeters.
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