well i bought a parts car (90 gt) and it came with bbk off-road h pipe with no cats.  i would go with long tube headers, but i already have the off-road h pipe. 

I DISAGREE.  LIKE I'VE POSTED BEFORE YOU NEED CAM, HEADS AND INTAKE TO SEE THE FULL BENEFITS OF A LONG TUBE.  WITHOUT THEM YOU JUST LOST YOURSELF A BUNCH OF BOTTOM END TORQUE. 

THE EQUAL LENGTHS SHORTIES DON'T LOOSE TORQUE LIKE THE LONG TUBES BUT AGAIN YOU DON'T SEE THE FULL BENEFITS WITHOUT THE ABOVE MODS.

YOU CAN PUT ON THE MOST FREE FLOWING CAI AND EXHAUST BUT YOUR HEADS CAN ONLY FLOW SO MUCH AIR WITHOUT IMPROVEMENTS!

COMMENTS

Thats not true.  Do you know how longtubes work?  Or why equal lenght shorties are better than unequal length shorties?  Some people swawk all day long about losing torque with longtube headers... well the fact is anytime you lower backpressure you will lose low end torqe (very low end by the way).  Torque doesn't win races.  Torque is simply pressure applied to the ground, HP is the amount of work that torque is actually doing.  Who cares if you lose 1 ft lb of torque at 2k rpm, when you pick up 10 ft lbs of torque at 4k rpm and 15 more hp peak hp. 

Long tubes and equal lengh shorties work on the same principle, get the exhaust to travel the perfect distance away from the heads before they get to the collector, and to have equal length tubes so that the exhaust pulses all hit the collector all at different times, minimizing potential hp loss from two pulses trying to get through the collector at the same time.

The point I am making is that you keep the shorties on your car all you want, but when you have other mods on your car too with those shorties and other mustangs with nothing but longtubes blow right by you, you'll be thinking of me.

TORQUE DOES WIN RACES.  HP DOESN'T GET A CAR MOVING TORQUE DOES.  I'VE USED LONG TUBES ON SEVERAL CARS BUT THESE ARE MOTORS THAT ARE MAKING IN EXCESS OF 350HP WITH CAMS & HEADS. 

TORQUE IS A FORCE WHICH ROTATES. (CRANK, TRANS, DRIVESHAFT...TIRES..HUM I SEE)  HP IS CALCULATION OF TORQUE VS RPM (WITH SOME CONSTANTS FOR UNIT CONVERSION OF COURSE).  IF YOU DON'T HAVE TORQUE YOU GOT NOTHING.  WHY DO YOU PUT GEARS IN YOUR CAR? TORQUE!!!  HOW ABOUT A HONDA WITH 200HP AND 150 LB/FT. DO YOU EVEN WONDER WHY THEY'RE SLOW. 

AND AS FAR AS A LONG TUBE ONLY CAR BLOWIN THE DOORS OFF A MODIFIED SHORTIE CAR.  GIMME A BREAK.  I REALIZE YOU'RE A L.T. GUY FOR YOUR SIG STATES. 

THE POINT I'M TRYING TO MAKE IS YOU DON'T NEED LONG TUBES TO MAKE POWER.  NOT THE KINDA POWER THAT WE'RE TAKING 'BOUT ANYWAY.  I'VE GOT NOTHING AGAINST THEM, I JUST USE THEM ON RACE MOTORS NOT STREET MUSTANGS.  IS NOT WORTH THE COST TO HP RATIO.  THATS JUST ME, AND WHAT DO I KNOW

You damn sure don't know how to unpress that caps button.  Oh, and by the way, you daon't have to take my word for it, just ask anyone who put lontubes on their car that had shorties before, or any before and after dyno runs.

Listen, Torque is simply the force applied on a object, Hp is the amount of work actually being done.  Listen, if your trying to break a bolt loose with a breaker bar, and your puttin 100 ft lbs of torque on the bolt and it still aint movin, you ain't gettin any work done (i.e. hp).  We can go at this all day long if you want.

Theoretically, if two identical cars with identical weight, gearing, and the same in every aspect other than power from the motor (not really possible but lets pretend it is).  Car A has 200hp and 120 lbs of torque (obviousy high rpm car), and car B has 120 hp and 200 lbs of torque (obviously low rpm car) who do you think would be the faster car?  If you say the car with more torque your wrong. 

Same scenario, Car A has 200 hp and 120 lbs of torque.  Car B has 200 hp and 300 lbs of torque.  Who wins?  They both run the same speed.  Why?  Because they are both doing the same amount of work.

Listen, don't get me started.  Reguardless of what you think you know, you don't.  I have probably FORGOTTEN more about cars they you will EVER know.

Please don't post anymore mis-information.  I don't have time to run around cleaning it all up while you steer people wrong.  If you don't want longtubes, then suit yourself.  Don't tell someone else to not get them for the wrong reasons.  Opinions are one thing, but don't post false information.

HAVE YOU TAKEN ANY PHYSICS?

Sorry, I thought my comment was outta line.  And the caps. I use the caps at work all the time which is where i'm at and it just easier.  out

will do!

well for your information i have :

ford e303 cam

edelbrock performer 5.0 heads

engine is bored out to a 306

cobra intake manifold

other mods, but they wouldn't apply to intake of air......

expected rwhp is around 325-375; with this info, are long tube headers worth the money? or will shorty equal length headers ok for my 5.0? i know you 2 argued, but there was no clear answer, so what should i do? just stay with the shorty equals since i already have a bbk off road h-pipe?