Blk_Ws6

iTrader: (4)

I never knew what the rwph was from the average good set of headers whats the rwph?

BigE_LS1

I gaind 28 hp and 31lbs with kooks headers , y pipe with cats and a tune.

94'BLKBRD

iTrader: (76)

^^^^ Thats really good for a y pipe and cats

Dex

iTrader: (5)

That has a lot to do with it
i also doubt this was back to back more like months or years apart

94'BLKBRD

iTrader: (76)

I know the numbers reflect on the tune, still good #'s through a catted y.

DonnieDarko

iTrader: (3)

I gained 31 hp & 29 ft lbs. from the kooks lts, catted y & a tune. The dyno pulls were done 1 day apart. The power gains were unbelievable. Like a different car.

Blk_Ws6

iTrader: (4)

So I see 31 over 29 ok thats with the tune I wanna know about headers alone what will I gain?

DocEwww

iTrader: (1)

Nothing you will really feel. Usually between 10-20rwhp, depends on the dyno, the weather, the car, brand of headers, with or without cats, etc.

My opinion has always been that headers are only worth doing if you plan on modding the car past the point of bolt ons (Cam only or with upgraded heads, FI or nitrous) OR you really just want the sound.

TheSilverOne

iTrader: (22)

majority of the people here won't have dyno numbers from just headers.

Dex

iTrader: (5)

I prefer track times its hard to dyno race

Tainted

iTrader: (9)

all lnog tubes get about the same. some are jsut a few more some are jsut a few less all within like 5hp of each other

Redlinez

iTrader: (5)

I will add that I have found gains with a retune after just about every single change to my car. Of course, I have to give credit to the tuner (Jeff @ Mayhem) for spending the time and making it happen. I had to retune after going to a custom catted Y, lost major power but gained quite a bit of it back with a tune. On my last 99 LS1, I picked up 3X/28 with Jethot longtubes.

Blk_Ws6

iTrader: (4)

Ok I let's say I run 13.3 @106 what will headers give me from here?

chrs1313

iTrader: (24)

if the tune is dead nuts on before then the gain after with a tune is only around 15rwhp...headers are over rated...do other bolt ons first...

ZMONSTER!

iTrader: (9)

wow I never ever thought I would see someone say headers are overrated! To most people headers are the first mod made, after a lid.
OP, they all pretty much make around 20 rwhp from what I have seen. There are many factors that can effect that number though.

Blk_Ws6

iTrader: (4)

Thats what I wanna do all bolt ons just in case I might not want headers I hate the loud noise .

BigE_LS1

It was done on the same day . I gaind 18hp and 20lbs from just the kooks the rest was from the tune. Was doen at gforce back in march.

Blk_Ws6

iTrader: (4)

So by adding a ls6 cam I would pick up more then headers right?

BigE_LS1

From what i have seen a 98-00 fbody will gain about 15-20 hp and a 01-02 will gain about 20-25hp."that what i have seen with my own eyes" by going with the ls6 cam.

chrs1313

iTrader: (24)

i ran 11.72 at 115mph when i still had stock cats, manifolds, and y pipe going through a cutout...after my qtps the times dropped to 11.55 at 116mph...same DA conditions...so again around 15rwhp at max...unless of course your tune is off or you decide to run in better conditions (DA) and not record it...plus kooks are around $800...not the best mod considering you can get about 20-25 rwhp from a ram air setup for around $60...