3 inch vs twin 2 1/2 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

AU2XLSV8 · 09-05-2004, 22:13

Which is best? there is obviously a flow diifernce between the two but is there a descent amount of power or torque to be had in one over the other. I am thinking of this for my ute. N/a vs boosted application may be relevant.

ebxr8240 · 09-06-2004, 01:40

Both are good..With single 3" is more critical what type mufflers are used..To keep sound and good flow top quality is needed...

fOrD mAn Xf · 09-06-2004, 02:10

I remember someone saying that a 3" creates more backpressure in the exhaust or something, or a loss of pressure which can restrict the flow....not sure if its a wives tale or true??

eb2flyz · 09-06-2004, 02:22

get the best of both, run a twin all the way to the diff merge them into a single 3" muffler then out the back as a single 3", works pretty good on mine.

ebxr8240 · 09-06-2004, 03:04

I doubt 3" is restrictive as I'm runing over 450h.p through one !!!2 X 2 1/2 and twin cats upfront through...
Yep two mufflers up front into single makes sence..That way an X pipe can be used....

svo347 · 09-06-2004, 03:46

3inch cats into a 3 inch Y piece, into a Genie s/thru tornado muffler...
Heavenly.... wouldnt you agree Flyz...

eb2flyz · 09-06-2004, 03:52

sounds nice brett, think mines sounds a bit tougher though :)

302_supra · 09-06-2004, 04:29

my windsor is to be running twin 3" straight throughs. Thats for over 400hp though.

svo347 · 09-06-2004, 04:36

Ahahahahahahahah im sure it was from my car mate echooing from the houses back into your window hahahah

eb2flyz · 09-06-2004, 04:36

n/a, you would have no bottom end pwr what so ever with twin 3"s, a single 3" is more than enough for 400hp