should i get GMPP Extruded Honed Performance Exhaust Manifold while i am having my stage 1&2 and K&N Typhoon installed at the dealership ! its an extra $400 but need to know if it is going to give me any noticable performance diff. or if it's not really neccessary ? please help me decide!

 

Get a header/ downpipe combo. JMO.

 

I got mine installed when I purchased the vehicle. I never really noticed anything.

I would go with a Header Downpipe. You should check out Cobalt Addiction they have a nice setup.

 

Yes the CA setup works nicely. I have the CA header and downpipe with GMPP exhaust.

I have 0 complaints.

 

i would go with zzp there header has a 2.89 in collector i think the cobalt addiction ones only have a 2.25 collector on the ones that are 199.99 at least, but whatever floats your boat

 

If your intent is to be as fast as possible with GM parts the extrude-honed manifold reportedly gives you 7% more flow. That's exhaust flow increase -- not horsepower increase.

Since you went with the K&N intake it looks like you're not staying stock-only. In this case a header will certainly provide more HP increase/potential over a manifold. If you're lucky enough to have a dealer that would put this on and not argue over your warranty go for the CA header.

 

So basicly everyone is telling me is to get something other than GMPP the only reason i want to know is because the dealership is putting stage 1&2 & CAI on Thursday and if they were going to have it tore apart it might have been a good time to invest in that as well! but if everyone is saying get another kind then i might just hold off for a while and get it from somewhere else. Thanks guys

 

My dealership supports the K&N not The GMPP thats why i'm getting it and i don't want to void the warrenty which getting the K&N helps me there. don't perticularly car about going with GM accessories but with 1500 miles I got a lot of warrenty left and don't really want to void it soon , Sooner or later Yes but not soon!

 

There isn't anything to be torn apart really. At least nothing near the exhaust.

If you want the most gains, go with aftermarket.

 

thanks guys i think i'm gonna pass on the Extruded Honed Performance Exhaust Manifold and wait to get a CA header which is not covered under my warrenty down the road!

 

Good call. Cobalt Addiction's header is nice, I have it.

Remember, the only way they can't cover something under warranty is if the aftermarket part directly caused the problem.

In other words if your sunroof stops working they can't say your warranty is gone because of a header.
It would have to be the header's fault.

 

ok now that i've cleared up that i want a CA Header what else should i get from there back?
I might need to go on a shopping Spree!

 

Do you have the GMPP cat-back performance exhaust? If not, get it and a GMPP exhaust tip (angled or straight - your choice).

 

you didnt feel anything cuz you purchased your car with it installed, you had nothing to compare with, i installed it a few months after i installed the gmpp sport exhaust and i felt a nice difference, to each there own.

 

ok i'm not a performance savy person so is the header attatched directly to the Cat back or is there anything in between i've heard down pipe and not quite sure i know what that references to?

 

CA header fits in place of manifold -- no alterations needed. GMPP performance exhaust replaces original exhaust perfectly -- just have to cut out the original system to install it. CA has downpipes to replace your original downpipe too -- go to their website for info.

 

A flexpipe,downpipe, and catalytic convertor is between the header and catback.

 

Thanks distillion Thats what i wanted to know in the beginning. just don't want to buy something then turn around and have buy something better. I'm in no real hurry with getting anything but all my work will be done by shops so its more efficient to get things
done together wherever possible.I'm Just not a mechanically inclined person!

 

stage 2, 2.85 pulley, gmpp exhaust manifold and sport exhaust, C/A 2.5 dp with high flow cat and an intake( injen) made 255, hp and 232tq untuned .

 

A piece of advice..do the entire exhaust in one shot (no matter what parts you end up going with) you will save money on the install that way.

 

do i need to uprade those peices as well! and can i get them from CA as well if so!

 

Those 3 pieces are actually all conected when you get a downpipe (one with a cat)

The choice is yours to upgrade. The aftermarket piece does smooth out a section where the stock one narrows.

 

Alrighty thanks everyone I know a lot more about my choices now and that really helps me go forward and research more about the parts i need to look into!

 

NKs, go to the Cobalt Addiction website and look at the products they sell.......their link is on the home page (left side).