2.5 in or 3 in

02stang281 · January 2nd, 2007, 05:20 PM

Going to do Headers and full exhaust should I get 2.5 in or 3 in

White99stang · January 2nd, 2007, 05:25 PM

2.5 will be fine

blown03mach1 · January 2nd, 2007, 05:39 PM

People tend to go over board with the exhaust diameter. Remember your engine NEEDS some back pressure in order to give you the numbers you are looking for.

2.5 should be good to around 450-500 and above that I would go 3.0. I am running a 2.5 and pushing 458 to the ground if that helps you.

02stang281 · January 2nd, 2007, 05:41 PM

cool ty

Sable · January 3rd, 2007, 04:12 PM

Originally Posted by blown03mach1

People tend to go over board with the exhaust diameter. Remember your engine NEEDS some back pressure in order to give you the numbers you are looking for.

2.5 should be good to around 450-500 and above that I would go 3.0. I am running a 2.5 and pushing 458 to the ground if that helps you.

+1 - no need for over kill unless you have big plans down the road.

TheManInBlack · January 3rd, 2007, 08:05 PM

a recent 5.0 mag done a test on a 3v mustang and they ran 3 inch exhaust and it gained less than 10 horse to the wheels i believe. that car a had a blower on it also lol. 2.5 can support alot of power. 2.5 seems to be the happy medium and its what most people run.

Danny01gt · January 3rd, 2007, 09:53 PM

My friend is using a 2.5 on his whipple cobra and its pushing 700hp. 3in is plain overkill unless you are strickly building it for the track and have some major nitrous or forced induction goin on.

January 2nd, 2007, 05:20 PM	#1
02stang281 Newbie Join Date: Jan 2007 Location: Albuquerque NM Posts: 7	2.5 in or 3 in Going to do Headers and full exhaust should I get 2.5 in or 3 in

January 2nd, 2007, 05:25 PM	#2
White99stang #1 Asshole Mod Join Date: Aug 2005 Location: elkridge, MD Posts: 2,562	2.5 will be fine __________________ 99 Mustang GT VT 302 Stroker (race car) 11.13@123 for sale 9.7k 06 Dodge MegaCab. Cummins diesel power. Silencer ring removed, intake baffling mia, and swiss cheesed air box, Isspro pyro, boost, and tranny gauges, 6inch chrome tip

January 3rd, 2007, 08:05 PM	#6
TheManInBlack Regular Join Date: Nov 2006 Posts: 96	a recent 5.0 mag done a test on a 3v mustang and they ran 3 inch exhaust and it gained less than 10 horse to the wheels i believe. that car a had a blower on it also lol. 2.5 can support alot of power. 2.5 seems to be the happy medium and its what most people run. __________________ 2002 Mustang GT, BBK LTs, X-pipe, Bassani BX, MGW Shifter, FRPP 4.10s, Moser 31s, Cobra diff, SCT Xcal2, JLT CAI, Accufab 75mm TB/Plenum, eibach sportlines, strange adj struts, tubular control arms, and One Heavy Foot....

January 2nd, 2007, 05:39 PM	#3
blown03mach1 Newbie Join Date: Dec 2006 Posts: 15	People tend to go over board with the exhaust diameter. Remember your engine NEEDS some back pressure in order to give you the numbers you are looking for. 2.5 should be good to around 450-500 and above that I would go 3.0. I am running a 2.5 and pushing 458 to the ground if that helps you.

January 2nd, 2007, 05:41 PM	#4
02stang281 Newbie Join Date: Jan 2007 Location: Albuquerque NM Posts: 7	cool ty

January 3rd, 2007, 09:53 PM	#7
Danny01gt Newbie Join Date: Jan 2007 Posts: 18	My friend is using a 2.5 on his whipple cobra and its pushing 700hp. 3in is plain overkill unless you are strickly building it for the track and have some major nitrous or forced induction goin on.

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