I want to do some type of header and down pipe.
Im looking at the GM manifold because It's cheap and is a gmpp part (I like that).
My cat is also starting to plug again (it happened before) so I want a down pipe with cat that sounds good.
Im thinking an xtc with cat.

What size down pipe should I get? 2.5'' or 3''?
Am I being stupid about the gmpp manifold? Should I spend more and get a real header?
What is the best sounding combination I can get?

Ive read all the posts and searched for 2 weeks, thanx again...

 

Since you have the GMPP Exhaust, you should get a 2.5" DP. I have the same exhaust, the XTC DP w/ cat, and the Pacesetter Ceramic coated header. Waiting for the DP still to install them all. I'll you know how it turns it though, if you don't make a decision by then lol. Also, there is a potential group buy for the GM manifold, it was posted today, search "GM exhaust manifold group buy" or somethin like that.

 

GM Manifold wont yield the same gains as a real header

Get a real header

 

if your wanting the best gain and not worried about cheapness go cti

 

Supposedly it does.

 

who lied to you and told you that?

 

maybe the dancing locks????

 

One of the 36 quadrillion posts here about it had a like to an independant dyno test showing it produced the same numbers as the headers they were compairing it to.
I tried to find which of the 36 quadrillion posts it was but I'm at work and don't have till Christmas to find it. Sorry.

But if you guys say it doesn't thats cool. All I know is what the dyno showed.

 

I dyno'd 211hp with the gmpp manifold and 236hp with the cti header and downpipe. no stock dyno since i got the car with the gmpp on it. both done on rev it ups dyno.

 

Cool! Like I said I only had to go on the dyno charts I saw in the link. Thats a HUGE gain!
25HP! Holy Crap!!

 

So, what your saying is. CTI is the way to go? Hows the sound?

 

The CTI one, thats not the $700.00 header and downpipe is it?

 

I think it is. Does anyone know if this header/downpipe will bolt to my GMPP exhaust? How does this combination sound?

 

I would say that cti downpipe is what gained you kinda hp/tq. there is alot of threads of dynos on here that will say its the same hp/tq as any other header.

 

cobalt-addiction is releasing a header tomorrow for a 2.5 exhaust, blowout sale at $199.99 plus shipping, to go with their 2.5" downpipes... 3" version is coming soon... stay tuned
they have 10 in stock right now with a whole bunch more coming in next week... should be posted up on thier site tonight or tomorrow

 

where can u get the cti header at

 

first of all cti is the 700 dollar one

second of all a downpipe isnt going to give you 25 horsepower its the combo of header and downpipe

third you can get cti header at www.customtubesinc.com

 

I'm going with the Pacesetter, it looks like a good header and well put together. I picked it up yesterday.

 

looks promising. thanx

Im still leaning towards the gm manifold because it's very stock looking. I like telling people that all i have is an intake and cat-back, lol.

 

For $700.00 that thing BETTER give you 25 horses a a blow job everytime you start the car!

But as long as your happy with it I guess.

 

yea its pricey but thats cheap as hell for 25 horses just think

you can get a header downpipe and exaust that wouldnt give that many horses and cost you just as much if not more

its common sense if u want your car fast your going to have to spend some money

my motto is go big or go home

 

Don't take any of this the wrong way cause none of it is ment as a flame and where that is true and I do agree with that school of thought you do realize thier is such a thing as more dollers then sence right? Thats just too expensive for a header and down pipe. I could have had custom made headers for my Fire Bird made by a local shop for less then that one header costs. If you got it like that great but NO header is worth $700.00 sorry.

And as for go big or go home, lets just say the last engine for my Fire Bird ran me a tad over $22,000.00 to have built, yes my engine cost more then my Cobalt SS did. It was a daily driven 10 second street car and this was 5 and 6 years ago. So I know all about going big.

But like I said before if it makes you happy go for it!

 

well its not just for the header its a header and downpipe

any other header will run you 200-300 dollars and any downpipe will run you about the same

the increase from those will only be what 15 horse at the most???? you do the math plus a downpipe you get might not have the option of taking out the cat and putting it back on like the cti does

and yea you spent 22grand on your engine y???? cuz it was the best way to go to give you the best performance

you could have a lot less just to get you by but you wanted the best and it was also worth that much to you

same deal with the header and downpipe we can spend less but its the best way to go for the money with the hp gains

 

Oh I know thats why I said I wasn't flaming. I guess its just that since I have a friend that owns an exhaust shop that when I hear real world prices on the stuff that he does for 50bucks for me it floors me! Oh well best of luck with your header and down pipe.