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View Full Version : Single Pipe to Twin - Pro's & Con's?


Chuck_g
11-08-10, 14:22
Hey All

Just wondering is there any disadvantages to changing a single massive exhaust pipe to a twin set up?? If ya had a 4 inch pipe, what would be equal?? 2 2inch??

Cheers
Robbie Daly Ps13
11-08-10, 14:47
Well half of 4 is 2 chuck so im sure 2 and 2 would be equal.....:p I also would like to know bout this....! Dan moorehead had a straight pipe back into twins and it sounded awsome.....!
Baz_180
11-08-10, 15:02
Well you would have more volume in the 4inch pipe
A 24inch long 4inch pipe has twice the volume as 2 x 24inch 2inch pipes.
DaveM-sport
11-08-10, 15:40
Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.
Aidan Hogan
11-08-10, 15:45
Yowdy has twin pipes on his so try asking him ??
Aidan Hogan
11-08-10, 15:46
Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.

Too many numbers there for me but does that answer the question :confused:
PeterT
11-08-10, 15:47
Twin pipes are pimp! Mine sounds awesometastic. Theres all the answers you need
Baz_180
11-08-10, 15:49
Oh right my bad! learn something new everyday
Chuck_g
11-08-10, 16:11
Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.

Holy shit Dave...................:p


Twin pipes are pimp! Mine sounds awesometastic. Theres all the answers you need

What i thought yes, will go nicely with next years look :)
DaveM-sport
11-08-10, 16:12
Oh right my bad! learn something new everyday

No, you were right. Two 2" pipes have alot less volume than one 4" pipe. I just used alittle bit of old basic maths to find out he needs two 2.8" pipes to have the same as what he has now.

It's just that maths is pretty had to write and explain on a forum :o

Therea more too it than just volume like friction losses, turbulence and all that shit in the different sizes of pipe but fook going that far:rolleyes: :p

Pros would be, the twin pipes sound better.
Cons would be the system would be heavier than a single pipe and it's twice the piping you need to make again if you break it or it falls off :D
stevek
11-08-10, 16:17
so where do the twin pipes start from?? just after the turbo?:confused:
HADE MOTORSPORT
11-08-10, 17:29
Any of the twin pipes i have done were only about 18"to24" long where the back box used to be they sound the job. i have even done some side exit exhaust but these would be purely competition only
ste
11-08-10, 18:15
Any of the twin pipes i have done were only about 18"to24" long where the back box used to be they sound the job. i have even done some side exit exhaust but these would be purely competition only

hoe much would a twin pipe set up cost on lets say my r34...
Alan B.
11-08-10, 18:27
relocate you back box to work as a mid box, and run twin pipes from there all the way back :D
grimix180
11-08-10, 20:51
i have a 3 inch pipe which goes to 2 3 inch pipes at the back sounds the nuts
HADE MOTORSPORT
11-08-10, 21:30
hoe much would a twin pipe set up cost on lets say my r34...

pm sent lad
Mick K
11-08-10, 21:33
Out of interest,Whats the new look for the car Chuck?

Paint?
Chuck_g
11-08-10, 21:41
Out of interest,Whats the new look for the car Chuck?

Paint?

What a silly question................ul see when its done!
PeterT
12-08-10, 08:50
relocate you back box to work as a mid box, and run twin pipes from there all the way back :D

back box? mid box? naaaaaah, 3 inch from turbo into two 3 inches from the diff back:D
Newsome
12-08-10, 09:01
pm sent lad

Pm me cost aswel.:D For an s14 drift car so doesnt need to be pretty.
PeterT
12-08-10, 10:17
http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00930.jpg

cut my old system in half, and tabbed on roughly where wed like this one

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00932.jpg

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00933.jpg

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00934.jpg

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00931.jpg

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00935.jpg

however the apexi exhaust control valve wasnt happy with its ground clearance so i had to take it out

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00937.jpg

but fuck it, looks bad ass. Thanks mick and jay!

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00938.jpg

http://i169.photobucket.com/albums/u230/PeterTistaken/my%20cefiro/DSC00941.jpg


Yes, everyone should have twins!
tweek
12-08-10, 17:18
Anyone actually use a 3inch without a backbox and then change to twin 3inch???? Much of a difference in sound??
Chuck_g
12-08-10, 17:25
Now thats exactly wat i want Pete, lovely dude!
PeterT
13-08-10, 07:10
Anyone actually use a 3inch without a backbox and then change to twin 3inch???? Much of a difference in sound??

My original exhaust was 4 inch actualy I do beleive, with a backbox that did fuck all to quiten it, its got way louder since puttin the twins onto it!


Chuck, I thought you hated twin pipes!?