Fb0dy0nly

iTrader: (10)

actually, some have gotten near 20 more horses by going with TDs, but it is usually with 3'' bullets dumped and is all up-top.

LilJayV10

iTrader: (39)

I am thinking about getting headers for my car. But only 15-25 hp, man thats not that much. Not for how much headers cost for these cars. If I do it's going to be the OSX headers. Then I will need to get a LS6 manifold, then a tune, and I might as well go ahead and put the 4.10's in it if i'm getting it tuned.

Oh it never ends.

NHRAMAN

iTrader: (1)

+ the SOUND....WELL WORTH IT FOR THAT ALONE. 20-25HP W/O tune approx.

lsx24

iTrader: (45)

You can see here are my gains from Stepping Up to true duals from a stock ypipe setup. Headers were already on the car and I just added Bassani TDs, (with linear Magnaflow high-flow cats), which come with a volumetric xpipe crossover. The Bassani kit has all the airflow of straight pipes. No rinky dink piece of $hit crossover in this top shelf kit.

Soul TKR

iTrader: (4)

so it basically looks like you just gained torque... correct?

lsx24

iTrader: (45)

That's right. Just about 20 lb/ft, from a TDs. Later on I changed the Bassani "chambered" muffler for a dual-in dual-out dynomax stainless steel muffler from Jegs, and dynoed relatively speaking the exact same curve.

Soul TKR

iTrader: (4)

interesting... that is a nice jump in torque... just odd you got only 1hp out of it... but hey it's still a gain somewhere so...

jpajkos

iTrader: (3)

Well my buddy with a 98 Z28 A4 with just Long tubes, ORY, LID, and Pulley put down 338 to the wheels. Stock A4 puts down anywhere from 280-300 so im sure he gained at least 25 if not more to the wheels from his longtubes.

92SilverSHO

iTrader: (3)

Well my last dyno was 328/338 with lid/cutout.

Then i added Ported TB, ls6 intake, longtubes,ORY, dual dual muffler and a tune and got 341/345. It was on two different dynos so i couldn't tell you how much i gained. If i gain hopefully 4mph on my trap speed, ill be happy!

Redlinez

iTrader: (5)

I had 312/322 with lid, magnaflow catback, descreened maf, TB bypass. Not sure if I had done the maf and TB before or after. Now have QTP's installed, new TR55's and MSD's and after they richened me up top, mine put down 331/341. I still need the Ls6, ported TB, and UDP. The cam is where it really becomes additive. I think they are all really worth 15-20 on stock bolt on cars, 25-35 with cam/bolt ons, etc. Keep in mind, we installed a Pacesetter Y and they had to cut it and weld in several places.

lsx24

iTrader: (45)

Huh, now you got me thinkin, I don't know why it lossed 1 hp. Actually if you ask me, there has to be a reason for it. Hopefully someone more knowledgable about airflow and velocity can chime in. I know it's not the cats, because they are high flow magnaflow converters, which should flow a heck of a lot better than the little stock converters that were originally on the car.

ErikElvis

iTrader: (1)

I put my LT's on in the winter time. It was a dramatic difference the first time I opened her up. Now Im use to it and its slow again. I did pick up 2 tenths in the quarter and approx 4-5mph.

Ripper415

iTrader: (6)

i wouldnt say you lost any hp. every time you dyno a car the results can be off by a bit (i forget exactly how much but i think it's at least 1%). so going with a 300 hp car you can do back to back dynos and show a loss or gain of 3 hp. so in theory you could've actually gained 2 hp but it showed up as a loss of 1 (just something to make you feel a little better).

miamifan3413

iTrader: (1)

I got 18hp/20tq w Mac mids....only 10 with lt's, something isn't right

92SilverSHO

iTrader: (3)

its hard to tell how much you gained unless you use the same dyno/operator.

lsx24

iTrader: (45)

I used the same dyno/operator. Here you can read about my conundrum:
https://ls1tech.com/forums/generation-iii-external-engine/743205-interesting-results-after-bassani-true-duals.html