What's the best for turbo applications?
What's the best for N/A applications?
Advantages/Disadvantages of larger/smaller pipes for certain applications.

 

You can find yourself a Magnaflow or something with 2.25 inch piping for cheap. Then run a test pipe. It will flow better than you think. I am currently running a 2.25 inch magnaflow with a cat, and I definetly saw some sick *** power gains that late evening.

 

hehehe...........well, I see petey sure answered your questions! I think he was replying to a different thread.......lol

Okay, now for some answers:

What's the best for turbo applications? 2.5"
What's the best for N/A applications? 2.25"
Advantages/Disadvantages of larger/smaller pipes for certain applications. Read this and your questions will be answered: https://www.hondacivicforum.com/m_39...y/tm.htm#39893

 

^ +1

 

1.turbo apps-Id say 2.5 to 3 inches is good, depending on how many psi.
2. 2.25 to 2.5 is good
3. again, diameter of pipes is all about keeping the velocity as Sacicons said before. Id say for a D series 2.25 is good, and for B 2.5.