[86er]

Originally Posted by sharkbait Alright so i checked my book "Building 4.6/5.4 on the dyno" and as i saw they add about 15hp15tq give or take. Thats with Lts With shortys they gained like 3-5hp and 3-5tq. Do i need to post charts or are we good?

Im glad someone else gets the shorties ARE A WASTE OF MONEY, TIME AND METAL.

If you are going to do that, just leave your stock manifolds on. I never ever understood why someone would buy shorties.

I love the lame excuse, well I can bolt it up to my stock exhaust bla bla bla

rep for the hp post

[Mustang68]

Originally Posted by 86er Im glad someone else gets the shorties ARE A WASTE OF MONEY, TIME AND METAL. If you are going to do that, just leave your stock manifolds on. I never ever understood why someone would buy shorties.

your not the only one there...

[Eagle2000GT]

A lot of people swear by LTs. But most of the time they are doing multiple things to their cars like LTs and an o/r pipe and a tune. So its difficult to separate what gives how much. I didn't see any gain on the dyno from LTs and a catted x-pipe. But, to be fair, the before and after runs were months apart with the first on a Mustang Dyno and the second on a Dynojet. Both showed 385 rwhp/ 370 rwtq though.

The thing that told me the restriction was still there is the boost did not go down after the LTs were installed. It was 8.9 psi at 6000 rpms before and 8.9 psi after. Boost should have gone down about 1 psi.

I've read other threads where the gains were minimal to none.

I'm beginning to think that its the o/r pipe that makes a difference. LTs with cats seem to be just as restrictive as the stock exhaust.

[RyanGT]

Originally Posted by Eagle2000GT A lot of people swear by LTs. But most of the time they are doing multiple things to their cars like LTs and an o/r pipe and a tune. So its difficult to separate what gives how much. I didn't see any gain on the dyno from LTs and a catted x-pipe. But, to be fair, the before and after runs were months apart with the first on a Mustang Dyno and the second on a Dynojet. Both showed 385 rwhp/ 370 rwtq though. The thing that told me the restriction was still there is the boost did not go down after the LTs were installed. It was 8.9 psi at 6000 rpms before and 8.9 psi after. Boost should have gone down about 1 psi. I've read other threads where the gains were minimal to none. I'm beginning to think that its the o/r pipe that makes a difference. LTs with cats seem to be just as restrictive as the stock exhaust.

Too many variables. Boost gauges will not read exactly the same. And if you had the same power on a dynojet and mustang dyno there is a pretty big difference in power! But even on 2 dynojets they can be different because of variables of how it is set up. Only real test is on same dyno.

And after my LT's my car really woke up! But i was at 14 psi. It is both the Lt's and o/r that makes difference. Cats are restrictive, but the LT's have the scavenging affect. If you pull exhaust (scavenging) and then bottle neck it at cats it won't have its full gain's.

[whtstang97]

Man. the sound of longtubes with slp loudmouths makes girls strip on their own.

[SWEET2KSTANG]

its funny to see some of you guys calim shorties are crap and make nothing, when there are gains to to be had across the whole power board. if the stock maniolds were a little better designed, then a set of shorties would be a waste. i can see why some want to stay to a shorty because of the trans, it can be a bitch to deal with the header for trans removal.

[HickRocket1258]

Originally Posted by 86er really, on a stock car, i put a set on for a kid and he picked up 18hp and almost 24ft lbs stock car ONLY mods done to it. so thats a waste right?!?

Yeah, but then you need a new midpipe, so technically not only mod, but I get what you are saying.

[Bullitt5339]

Originally Posted by sl04gt what kind of gears did u have before u got the 4.10's thats a nice drop in et

That's from the stock 3.27's

[Eagle2000GT]

Originally Posted by 86er really, on a stock car, i put a set on for a kid and he picked up 18hp and almost 24ft lbs stock car ONLY mods done to it. so thats a waste right?!?

What mid-pipe did you put on? Did you retune the car? Most people don't put a car on a dyno without getting a better tune. I read a post once where a guy said he say a Cobra get 60 rwhp with long tubes. Later he said they they had also changed a pulley on the supercharger.

[RALVAREZ26]

Originally Posted by dcrow I guess the point I was trying to make was granted you might gain 5 to 9 HP with the LT's over the shorties but to me it isn't worth the agony of dealing with the LT's and they are harder to install then the shorties,I've installed both and the LT's are a PITA to install.

well, my brother installed my longtubes and installed my friends bbk shorty and had more trouble installing the storty because he couldnt the bolt in since the are really bunched together. anyhow, it took less time and effort to install the longtubes than shorty's- for him that is.

[86er]

Originally Posted by Eagle2000GT What mid-pipe did you put on? Did you retune the car? Most people don't put a car on a dyno without getting a better tune. I read a post once where a guy said he say a Cobra get 60 rwhp with long tubes. Later he said they they had also changed a pulley on the supercharger.

that was before the tune, it was a bbk o/r xpipe.

after the tune the car picked up another 11hp and 13ftlbs on top of the initial gains

ended up at 268hp/299ftlbs

stock filter all the way up to the throttlebody/plenum

even had stock exhaust other than the long tubes and x pipe

[dcook_14]

Originally Posted by sl04gt yea i kinda figured that because after he gets the jump it just stays like that the entire way

If he had that much more power across the board then he'd pull on you the whole way. If he just jumps out and stays out a car length, it's the gears.

Plus you have Pypes LT's, no offense but that's kinda bottom shelf exhaust.

Originally Posted by sharkbait Alright so i checked my book "Building 4.6/5.4 on the dyno" and as i saw they add about 15hp15tq give or take. Thats with Lts With shortys they gained like 3-5hp and 3-5tq. Do i need to post charts or are we good?

What kind of motor? N/A or boost, baseline hp/tq specs? Other mods?

This is a great factual post of how shortys aren't worth the metal they're made from

Originally Posted by dcrow I bought some and returned them when I found out you have to remove them when you need to remove the tranny so I ordered some equal length bbk ceramic coated shorties. Between the LT's and shorties there is only a 5 to 9 HP difference so to me I'd rather have the shorties because of the minimal HP difference and you do not have to remove them to change the clutch or remove the tranny.

Most of the better LT's you don't have to mess with much when you do trans work. And the 5-9 hp difference (not sure where these numbers come from, sharkbait's data says 10-12) is a big difference to a lot of people. People spend like $450 for accufab tb/plenums that net them like 4 hp...

Originally Posted by whtstang97 Man. the sound of longtubes with slp loudmouths makes girls strip on their own.

I agree completely with this, LT headers sound awesome. I'm going to do LTs eventually (after all the other bolt on crap) just for the sound, and if it gives me a few extra ponies that's just a bonus

Originally Posted by Eagle2000GT What mid-pipe did you put on? Did you retune the car? Most people don't put a car on a dyno without getting a better tune. I read a post once where a guy said he say a Cobra get 60 rwhp with long tubes. Later he said they they had also changed a pulley on the supercharger.

Hhahahahah, yeah 60 rwhp from some headers. Oh yeah, I changed a pulley too but I doubt that did anything. Pretty sure the HP came from the headers

Originally Posted by 86er really, on a stock car, i put a set on for a kid and he picked up 18hp and almost 24ft lbs stock car ONLY mods done to it. so thats a waste right?!?

See next quote

Originally Posted by 86er that was before the tune, it was a bbk o/r xpipe. after the tune the car picked up another 11hp and 13ftlbs on top of the initial gains ended up at 268hp/299ftlbs stock filter all the way up to the throttlebody/plenum even had stock exhaust other than the long tubes and x pipe

That's where you got most of the power from. These midpipes are really what chokes the engine, not the catback/manifolds

EDIT, "even had stock exhaust other than the long tubes and x pipe" - Not trying to come off as a dick, but ou realize that long tubes and x pipe are 2/3 of the exhaust system, and the x pipe is responsible for most of the restriction right?

[Blackbird1084]

Well my car should be a great test bed then as I have an o/r x-pipe already. I'm gonna keep the stock mufflers on till I can hear what they are going to sound like and if they sound good I'll keep'em. But if not I'll probably go with magnapacks,slp lm1's or flowmaster outlaw race mufflers(they sound great on my TA).

[saxmanJJ]

How much weight do you lose by taking off the stock manifold and going to a longtube setup?

[99mustanggtman]

Too many variables man, temps, gas, operator, was this on the same dyno...etc

Originally Posted by 86er really, on a stock car, i put a set on for a kid and he picked up 18hp and almost 24ft lbs stock car ONLY mods done to it. so thats a waste right?!?

[Eagle2000GT]

Originally Posted by Blackbird1084 Well my car should be a great test bed then as I have an o/r x-pipe already. I'm gonna keep the stock mufflers on till I can hear what they are going to sound like and if they sound good I'll keep'em. But if not I'll probably go with magnapacks,slp lm1's or flowmaster outlaw race mufflers(they sound great on my TA).

Are you going to do before and after dynos? That would be interesting to see.

[dcook_14]

Originally Posted by Blackbird1084 Well my car should be a great test bed then as I have an o/r x-pipe already. I'm gonna keep the stock mufflers on till I can hear what they are going to sound like and if they sound good I'll keep'em. But if not I'll probably go with magnapacks,slp lm1's or flowmaster outlaw race mufflers(they sound great on my TA).

So you're gonna dyno your car right before the LTs and then install LTs and xpipe and go back to the same dyno, with the same person dynoing, the same temperature and everything and get before/after numbers? Fantastic!! I'm interested to see them.

BTW A TA is a pushrod engine, they sound a lot different than these OHC cars

Originally Posted by saxmanJJ How much weight do you lose by taking off the stock manifold and going to a longtube setup?

Most of the weight is in the midpipe with the cats. I know my O/R pipe is a lot lighter than the stock H. LTs might be a little more weight just because they are bigger, but also remember that the midpipe for the LTs will be smaller and lighter than even a full length O/R midpipe

[03_StangGuy]

Originally Posted by dcook_14 So you're gonna dyno your car right before the LTs and then install LTs and xpipe and go back to the same dyno, with the same person dynoing, the same temperature and everything and get before/after numbers? Fantastic!! I'm interested to see them.

I would be interested to see these results as well. Ive always wondered how and after market midpipe would do against LTs and obviously and aftermarket mid pipe. The biggest difference may be the power band opposed to actual peak number. I find it hard to believe that that stock manifold it that restricitve, being as short as it is. Im surprised there isnt a old comparison of exhaust setups for the 2vs.

[Modmotor4life]

A guy I know put LT's on and then dynoed his car and it lost power.

[Slow2000GT]

I got bbk shorties and love them I went to the dyno with same mods but long bbk tubes and I made 2hp and 4lb more than him and I did the 410 and 373 and kept 373 and beat people with the 410 and lt's plus still get great mpg's