alright well i got the car on the dyno and pulled 227, so whats everyone think its gunna pull after the JBP vortex headers,vortex downpipe,and slp dual outlet?

and i hope i did this right lol never set a poll

10 whp

x2...

You'll pick up at least 13hp... So 240-245 isn't too far fetched.

235-240... Full exhaust really wakes up the car. What mods currently?

when i picked it up the guy sayd i can expect 20-25 from the header alone but i think thats b.s so thats y im pushing for the 240 mark lol

the only thing that could affect it would be the intake, other then that performance clutch and short shifter

so you guys really think a gain of 20 is really possible?

when i picked it up the guy sayd i can expect 20-25 from the header alone but i think thats b.s so thats y im pushing for the 240 mark lol

the only thing that could affect it would be the intake, other then that performance clutch and short shifter

so you guys really think a gain of 20 is really possible?

No. 10-15 is more reasonable.

ill b happy with 10-15 lol OTT stage 1 kit is next:)

umm who ever posted for 245-250 can yu guys tell me why yu think so high unless your just kidding around?

whats the dyno, and air temps?

whats the dyno, and air temps?

no idea what yu mean bout what kind of dyno and when i got it dynod it was prob around 3-7 degress cel

dynojet, mustang dyno, dyna pack??

dynojet, mustang dyno, dyna pack??

im pretty sure it was dynapack, but does that really matter?

yeah, helps us determain what gains youll "see" dynapack as in they took your wheels off and bolted it to the car?

yeah, helps us determain what gains youll "see" dynapack as in they took your wheels off and bolted it to the car?

nopp lol srry i lied its dyno jet i just checked the website srry abotu that

then i'ld say you'll see right around 242/209

then i'ld say you'll see right around 242/209

thats exactly what sumone else sayd lol kinda creepy

wat do u have done? besides those mods

get stage 2

the only thing that woudl effect horespower would be the injen other then that i have a performance clutch and shortshifter

get stage 2

OTT stage 1 kit is next on the mod list dont wrry;)

get stage 2

fuck stage2, its useless

fuck stage2, its useless

yu mean gm's stage 2 right?

fuck stage2, its useless

Is the Warranty useless????

i kno warranty is useless if you get a custum stage kit but not if yu buy the gm kit

if u want power u go with a custom or ottp kit but if u want to keep ur warranty go with GM stage 2

already sayd that im going with the ott kit yu get everything you need for much less then buying eerything seperatley!

no what i'm trying to say is, anything thats gonna go wrong with the gm stage 2, can be fixed with a better and more likely cheaper aftermarket part, so why not go custom in the first place

already sayd that im going with the ott kit yu get everything you need for much less then buying eerything seperatley!

yeah i'm talkin to jimmy

my badd:)

yes, ott stage1 is a very nice package. good choice. but, my sig kinda says why i would say that

lmaoo yeah but dont wrry yur nto the only one who reffered to the kit there were many others just like yew lol

fuck stage2, its useless

Useless?? I disagree. It's a safe 20+ Whp that retains a 100K mile powertrain warranty. Sure a custom kit will net more power , but it's rare to see a staged car pop a motor on a 3.06" pulley.

Stage2 SUCKS.......until people want warranty work lol.

reading>you, try looking at post #26. i still see where youre coming from though, i just should have explained in that post why i think its useless and not in a later post

i unno i agree that the gm kit is useless unless you go for the stage 3 kit

alright im dropping off the car tomo morning nice and early so hopefully ill have it back for saturday then sunday ill go out and get the dyno, lets see who voted right!

i'm gonna go with the first 2 posts. I just had my car at the dyno and learned how humbling it can be. You probably won't net nearly what you think (to the wheels anyway). I'm thinking you've gained about 10 more hp.

i'm still gonna go with 240-243/209. a 15whp seems about right

any news on the install?

yea i went today and the header downpipe and tranny mounts are in so tomo its just the axels and cutting the hole for the extra outlet.but guys i have a question... so when i went to the shop today my mechanic told me that the exhaust doesnt have a catalytic converter, this means its not a cat back correct? but on the slp website it says that it is a catalyst-back system doesnt that mean it is a cat back system or is catalyst sumthing different?? plzz help guys im terribly confused lol

"cat back" is just a general term for "exhaust" in our case, the said "cat back" starts after the downpipe regardless if the dp actually has a cat or not.

10 hp

"cat back" is just a general term for "exhaust" in our case, the said "cat back" starts after the downpipe regardless if the dp actually has a cat or not.

so basically they just use it as a figure of speech now lol? and what do i do if i want a real cat-back?

well if you want a cat you gotta go get a New DP with a cat on it. YOu can buy ones with Higher flow cats. If you have emmissions you will never pass without one and your check engine light should come on as well

no im good forgot the JBP downpipe has a highflow cat thanks for the info thoe

lets hear some news

I have zzp header dp,a cat-back, intake, and h/e. And i made 237 fwhp and 204 lb tq

alright everythings in and it sounds damb amazing but honestly so bad in videos lol its very deep at idle and then while driving stays deep but not as much i luv it... just one probelm...this header gets mother F'in HOT lol so i need to fix that up a little and itll b ready to roll lol ill try and get a good vid with a better camera soon

whooohoooo got the car back yesterday and it sounds sickk!! its really deep and then at WOT it gets a little raspy but its ok i can handle that lol but yeah im gunna try and get ma girlfriends camera so i can take a good video and put it up!

well hurry up. and what did you put down on the dyno??

well hurry up. and what did you put down on the dyno??

i havent been able to go to the dyno yet the car was ready for saturday but i was n the hospital since sunday and go out yesterday at like 11 at night so i just picjed it up today i think im gunna b going on thursday thoe:)

on thanks giving? lol

on thanks giving? lol
well maybe for the americans lol but not for me and my candian people:)

o dang lol i didnt even look at that. fyi im canadian too ahaha so not all canadians wont be celebrating ;]

o dang lol i didnt even look at that. fyi im canadian too ahaha so not all canadians wont be celebrating ;]

lmaoo thats just trippy but yeah im most likley going thursday morning..fuck school:)

good call thats wat i always say ahaha

yup dyno is deffinitley more intresting then school and listening to some rando's talk to yu about how their university is better then the others lmaoo university fairs suck balls:)

well i got the car dyno and im extremley pissed off, I LOST 11 WHP!!! basically everyone was wrong! this is total bullshyt. the place i go the dyno done says i have no back pressure and i went to another shop and the guy unfolded the graph sheet and right away sayd yu ahve no back pressure i unno wtf is gong on but im pissed!

wow...

Having no backpressure isn't what hurts. You don't want backpressure. With an exhaust setup that minimizes backpressure, the powerband will be shifted up, so the loss of 11whp is puzzling. Probably the dyno and conditions.

well i got the car dyno and im extremley pissed off, I LOST 11 WHP!!! basically everyone was wrong! this is total bullshyt. the place i go the dyno done says i have no back pressure and i went to another shop and the guy unfolded the graph sheet and right away sayd yu ahve no back pressure i unno wtf is gong on but im pissed!

go back and backhand the guys that told you the problem is you have no back pressure and then tell them they're stupid

well if its not backpressure wtf is the prob?? and the dyno was done in the exact same place with same conditions

I wish I would've skipped the GMPP stage 2 myself... all I have left of it is the damn HUB!

I wish I would've skipped the GMPP stage 2 myself... all I have left of it is the damn HUB!

thats not the problem right now lmaoo

I think you'll be lucky to see 10-12 whp with everything without a tune.... the stock tune is what is holding you back... I did a full header, downpipe, 2.5" exhaust with crush bent piping and when from 241 and 229 to 261 and 232 and then after meth and pulleys and 3" exhaust I don't know where I am at now!

I think you'll be lucky to see 10-12 whp with everything without a tune.... the stock tune is what is holding you back... I did a full header, downpipe, 2.5" exhaust with crush bent piping and when from 241 and 229 to 261 and 232 and then after meth and pulleys and 3" exhaust I don't know where I am at now!

i unno if your confused or if i am but did you not see the post where i sayd i LOST 11 WHP!!

OH... HA HA HA HA..... that sucks but I can see it too!

you sure you don't have an exhaust leak?

you sure you don't have a boost leak?

nop already checked that another cobalt owner gave me a method of figuring out how to do that and he sayd its fine

well i got the car dyno and im extremley pissed off, I LOST 11 WHP!!! basically everyone was wrong! this is total bullshyt. the place i go the dyno done says i have no back pressure and i went to another shop and the guy unfolded the graph sheet and right away sayd yu ahve no back pressure i unno wtf is gong on but im pissed!

whoever was running the dyno has no idea what they're talking about. and the guy at the other shop either. just seems weird that they both would have no clue, and both give the same bs reason.

also keep in mind that dyno #'s are completely worthless unless you're tuning. said it a million times, you can go to 10 dynos right after the other and get 10 different #'s. it means absolutely nothing.

if you had a leak you would hear it.
loud hissing in the car.
or it would just sound brutal outside of the car, more so when revved.

backpressure isnt the case here.

you should loose some low end and gain up top.
youve lost about 11 hp.

cant say ive seen this happen with any other exhaust bolt on system on a stock tuned/pullied ss....

dynos are a tool yes.
a tool to view what is going on with your car.
in this case his stock run was normal
now the dyno says otherwise.
regardless of what was made stock, the point is he dynoed in similar conditions on the same dyno and his numbers depleted.
odd.

put some 42's and a 3.0 and u will re-gain that power and then some

put some 42's and a 3.0 and u will re-gain that power and then some

im buying the ott stage 1 kit when i get sum money so im not worried about that, im just pissed off because you spend all this money on products that are suppose to make your car better in performance but are really slowing yu down!

well u dont have anything but exhaust. the cars not puttin anything more out the back.

well u dont have anything but exhaust. the cars not puttin anything more out the back.

i dont get what your trying to say?

ur exhaust is prolly too big threw out need some back pressure. u basicly need to free up the front end some and u will gain most of it back

ur exhaust is prolly too big threw out need some back pressure. u basicly need to free up the front end some and u will gain most of it back


100% wrong. backpressure robs power, and you don't want it.

yeah its what was attempted but thanks to spaghetti headers it didnt really workout!! and if your saying piping size is to big, its 2.5 so its not big at all

100% wrong. backpressure robs power, and you don't want it.

i heard our car needs some backpressure to run good??

yeah its what was attempted but thanks to spaghetti headers it didnt really workout!! and if your saying piping size is to big, its 2.5 so its not big at all



i heard our car needs some backpressure to run good??

cars don't need backpressure to run good. it's an old myth. if you understand what backpressure is you would understand why getting rid of it is a good thing. do a quick google search, but skip the honda forums.

i was told a little is good too but i guess not

i was told a little is good too but i guess not

there's tons of topics explaining backpressure, i've made many posts about it myself. if you do a little searching through some older threads you'll learn what it is and why you don't want it.

to sum it up, basically it's air going the wrong way through the exhaust. which means the engine has to work harder to get the same amount of air out. that harder work = lost power. the idea in making more power is to make the engine more efficient. this is why a proper sized aftermarket exhaust usually gives some power gains, because the engine has to work less hard to get the air out.

there's more involved, but that's the simplified version.