8.1 Manifold..shorty,s..long Tubes

[yukon25008.1]

Im pretty sure my drivers side manifold is cracked/leaking so id rather at this time instaed of replacing the manifold with the same restrictive piece add headers, im just debating the style, from reading other posts its obvious the long tubes make more power..but by how much.. a shorty header is obviously less restricitive then the oem manifold and has to have a power increase.. just curious what exactly im looking at, i found a set of shorty headers for like $460 i was in contact with a guy from stainless works and a set of long tubes was $968 so id like to just get the shortys for now and if the long tubes are really that much better ill switch over when the moneys avaible and/or if i go with a comp cam, thanks in advance for any input

[yukon25008.1]

?

[Prokopchuk_9]

well shorties are for looks, dont know what the HP gains are with a big block but with a 6 litre shorties will give you like 5 hp at WOT. they look nice tho and are super easy to install and cheaper. i had pacesetter LT's on my 2002 and the power gains were like 25 hp and a little more t/q cant remember the exact figures. but it was three times the price price and i was fixing exhaust leaks. but after i got a better set of fasteners and gaskets it was okay. dont think its worth it if you dont have any other supporting mods like cam, head work or a blower. IMO for a truck like urs just get the shorties.

[yukon25008.1]

The shortys seem like like they would be much less restrictive than the oem manifold.. why do the long tubes make so much more power?

[Prokopchuk_9]

your engine is a big air pump....the primaries on lt's make your exhaust less restrictive for the exhaust pulses. less restrictive before the collector and the more likely to assist in the gases in the other primaries creating more effiency.

The easier your engine can "exhale" the more fuel-air mix it can process and the more horsepower it can produce.

[yukon25008.1]

I understand that.. i even noticed a difference when i hacked off the oem muffler.. i was considering an X-pipe after the cats before the new mufflers, to help balance things.. so besides a couple HP, what other gains will i notice with the headers.. any sound change?

[Prokopchuk_9]

i dont really have any personal experience with them but ive read that some of the better ones like JBA, gibson or edelbrock will give your truck a little bit more throttle responce but i dont know. might be guys just thinkin it does cuz they are excited LOL, but i mean they have to do something cuz they will flow better than factory casted headers. i helped a buddy put them on a 5.7 hemi once, they were gibsons i think not sure. and he already had magnaflow exhaust and it did sound a little crispier when he stepped on it....its all in how much money you wanna spend man...

[jro909]

the stock manifolds flow really well actually, you won't see much out of ST or LTs besides sound unless you tune for it...99% of bolt on shit for motors dosen't do much but lighten your wallet unless you get the truck's computer tuned to take advantage of the add ons

[uh6tdrvr]

the stock manifolds flow really well actually, you won't see much out of ST or LTs besides sound unless you tune for it...99% of bolt on shit for motors dosen't do much but lighten your wallet unless you get the truck's computer tuned to take advantage of the add ons

 

What are you basing your statement of wont see any gains out of LT's?

Find someone that has LT's with a tune and ask them if they saw any gains with LT's, not going to happen. Even Shorties show some gains on the upper end. Most with LT's see in the neighborhood of 30-40+ hp and more Tq all the way thru the RPM range with the biggest gains on the low end. Id bet you get somewhere in the 40s for Hp and Tq especially with a tune. You saw what Justin did with it the way it is now, drop him an email and ask him what a good set of LT's will do to that big 8. Stock manifolds just dont flow on BB's.

[jro909]

the stock manifolds flow really well actually, you won't see much out of ST or LTs besides sound unless you tune for it...99% of bolt on shit for motors dosen't do much but lighten your wallet unless you get the truck's computer tuned to take advantage of the add ons

 

What are you basing your statement of wont see any gains out of LT's?

Find someone that has LT's with a tune and ask them if they saw any gains with LT's, not going to happen. Even Shorties show some gains on the upper end. Most with LT's see in the neighborhood of 30-40+ hp and more Tq all the way thru the RPM range with the biggest gains on the low end. Id bet you get somewhere in the 40s for Hp and Tq especially with a tune. You saw what Justin did with it the way it is now, drop him an email and ask him what a good set of LT's will do to that big 8. Stock manifolds just dont flow on BB's.

 

 

your statement made little sense, and if you would of read my last post, i stated YOU NEED A TUNE TO TAKE ADVANTAGE OF ADD ONS, INCLUDEING LONG TUBES OR SHORTYS

[yukon25008.1]

i definitly will let justin adjust for the headers, i just dont want to waist the money on oem manifolds, but cant really afford the LT,s. so i was just hoping for some gain from the shortys.. in the future i plan to do a comp cam.

[kurt1993]

you know your problem probably isnt even the manifold itself its probably just the Rusted Bolts/studs or it could just be a gasket. id try and figure that out before you go and do something expensive cause just to fix my driver side leak it cost $500 i got new studs a new gasket and a new shield, and i believe my passenger side has a very mild leak right now

[old-chevy-dude]

the stock manifolds flow really well actually, you won't see much out of ST or LTs besides sound unless you tune for it...99% of bolt on shit for motors dosen't do much but lighten your wallet unless you get the truck's computer tuned to take advantage of the add ons

 

 

+1

 

 

LT work really well and will give good gains if you have motor work, CAM, HEADS, Tuning etc.

 

otherwise you won't see much gain, and I suspect you will lose some low end torque without proper tuning as a result of lost back pressure..

 

 

 

Shorties will help you out a bit for sound and a small gain, even without tuning, and are a mite cheaper than OEM units. and typically bolt right up to the OEM mid-pipes without complications..

 

 

here in the Republik of Kornifornia LT's are illegal, I had them on my last car with a 392 Hemi Stroker and the CHP gave me a healthy fat Fix it or lose it ticket.. (officer took a mirror and looked under the car specifically for the headers, and under the hood for illegal smog mods)..

[yukon25008.1]

I understand i wont see a huge improvment but somethings better than nothing, i just cant see replacing with the same thing, even if it just improved sound. im gonna leave the cats.So how do you guys feel about this x-pipe..will it help or hurt

[old-chevy-dude]

I understand i wont see a huge improvment but somethings better than nothing, i just cant see replacing with the same thing, even if it just improved sound. im gonna leave the cats.So how do you guys feel about this x-pipe..will it help or hurt

 

X pipe should help maintain back pressure assisting in adding more overall power. Adding bigger piping helps more exhaust evacuate the system but without the back pressure the exhaust evacuates slower reducing power on the low end