SiL3NtXWS6

iTrader: (17)

Going with a dual setup... using no mufflers and no cats.

My headers have 3 1/2 inch primaries and i plan to run 3 1/2in piping into the X and then dump it right after.

This is going on a car that makes roughly 800whp. I read that 3inch duals can only support rougly around 800-900whp, is this true?

I want maximum gains out of this. I have not seen a picture of 3 1/2 duals before.. but my floorboards have already been clearanced.

Lithium

iTrader: (47)

I believe 3" becomes restrictive around there...I would most likely go with 3.5 in.

orangeapeel

iTrader: (18)

You must be in the 40X+ cubes. Decide on your exhaust N/A unless this is a track car and rarely sees the street. If it is a full on race car then dual exhaust probably isnt the best idea for monster power. You probably don't see 3.5" duals because they won't fit unless you go with the BFH method on the underside of the car.

Lithium

iTrader: (47)

yea, and what he said.

SiL3NtXWS6

iTrader: (17)

It's not a track car but it's not a daily driver.

I use this car for street racing and track racing with some occasional stops in between.

So, you guys think i wouldn't notice a difference in power between 3 1/2in and 3in at ~560whp N/A?

baldurann

iTrader: (15)

Go with 3.5", you *****. Like I told you and told you, Dr. Gas 3.5" X-pipe! CAUSE THATS HOW WE ROLL DOWN IN THE SOUF SIIDDEEE, WE BE STRAPPIN THEM GATS, AND DEUCIN THEM CATSSSSSSSS

TheBlurLS1

iTrader: (8)

^^^ WTF? ^^^

This car has 3.5" duals on it.

http://cgi.ebay.com/ebaymotors/ws/eB...tem=4626930042

Might just want to get some 3.5" bullets and clamp them onto the collectors with a turndown.

steve2001sh

You need about 2.2 cfm and 20.3" of water per HP for max efficency. Pipes flow about 115 cfm per square inch across (a 3" pipe is about 7 in^2 -- 1.5^2 * 3.14).

3" dual
Max HP = pipe radius^2 * 3.14 * number of pipes * 115 / 2.2
738 HP = 1.5^2 * 3.14 * 2 * 115 / 2.2
3.5" dual
1005 HP = 1.75^2 * 3.14 * 2 * 115 / 2.2

Your call

SiL3NtXWS6

iTrader: (17)

Going with 3.5. Thanks for the help and math

TheBlurLS1

iTrader: (8)

Now your pipe will be bigger than ours.....

TheBlurLS1

iTrader: (8)

BTW - You need to be dividing all that by 2.2, not multiplying.

Max HP = (pipe radius^2 * 3.14 * number of pipes * 115) / 2.2 = CFM/2.2

steve2001sh

Thanks for the catch. I did the math right. I just typed it wrong. I will edit my original post.

98LS-WON

[QUOTE=SiL3NtXWS6]

This is going on a car that makes roughly 800whp. I read that 3inch duals can only support rougly around 800-900whp, is this true?

QUOTE]

I wish I had this problem.

SiL3NtXWS6

iTrader: (17)

maybe someday? I was cam only 4 times before i stepped it up