they are not irridium ... i will not buy irridium. they are pure copper plugs and since putting these in I have not had a single issue

 

irridium has a really large heat resistance ability but have a low heat disipation rating so while it can keep the plug from getting hot quickly it cant cool down very quick which means with a lot of hard passes or long rides of spirited driving or road racing the plugs' benefit becomes its weakness and the plug gets hotter and hotter

 

The car does come stock with irridium plugs though, and irridium is better than platnum. Irridium should be fine for most street apps, but if you like to drive fast and push it hard, or you changed your setup so your creating more heat (higher boost!), then copper would be a safer bet. You just have to change them out about 10 to 20 times as often.

 

Where's the best deal on copper spark plugs pricewise?

Also we agree .40 gap is ideal.

GMPP touring or GMPP Performance or Corsa Touring or Corsao Performance....yeah I'm still trying to make the right decision for me and my car's application....driving me batty

But eventually I'll decide!

 

copper plugs are so cheap it doesn't really matter where you get em from if you pay less than 15 bucks your good

 

I paid 5$ canadian dollars a piece. 15$ USD would be CRAZY expensive IMO

I got the GMPP touring and love it. I would DEFF go touring. Corsa or GMPP is preferance and big difference in $$$ Both are really good quality....

 

12 hp...nice jonnyB!!!!

 

i only paid 10 bucks us personally so if you pay over 15 your nuts thats why i said under 15

 

Yeah I'm tring to decide if the money is worth it for the Corsa. Some folks say hey if you're going to try and get 310 WHP *That is my goal* then you may want to use the Corsa for the 2.5" others say the GMPP will get me there or be really close to that mark.....

How often would copper plugs need to be changed around? 25K or 35K or 50K miles?

 

[QUOTE=CobaltSSilver;794877]Yeah I'm tring to decide if the money is worth it for the Corsa. Some folks say hey if you're going to try and get 310 WHP *That is my goal* then you may want to use the Corsa for the 2.5" others say the GMPP will get me there or be really close to that mark.....

If you want yo get #'s like 310 WHP, get a 2.5. I heard the magnaflow and it sounds awesome and cheaper than corsa!... but if you want 300+, dont bother with GMPP. IMO. And I got the GMPP, and I love it, but I want to keep it warrantied. Then when the warranty is over, I will be trading it for something else. (new model balt maybe, if it has enough HP.)

 

[QUOTE=martinsmu;796710]An exhaust won't void your warranty unless it causes a problem.....only problem that I can think of off hand is a CEL based on 02 sensor maybe.......I hear the magnaflow is great, a little loud *I wonder if drone is a problem with it in the cab, I want something easy on the ears cruising* but has issues with the elements....not rust mind you but she doesn't stay looking clean....is that b.s?

Also I'm tired of all this hear say....I wish we could get some hard facts on what the GMPP will support, if it restricts with certain mods ect...and when to go with 2.5, and which is better for flow Corsa, Magnaflow, Borla.

 

I finally got this piece of **** dezod 2.75 exhaust off of my car! i had it on since like august and its been raspy and loud as hell for me. replaced with a gmpp touring today and it feels like a brand new car. runs 100% smoother. feels much much quicker too!

 

damn those are impressive numbers i raced a guy that had gmpp exhaust stage 2 and intake , i have stage 2 , header downpipe and airbox and we were dead even kinda weird

 

you have stage 2 in you 2.4 (Red2.4ss/sc)

i smell something here.....

 

Yeah smells like the stock yards in Colorado!

 

Hey guys just so you know, 3" exhaust is way too big unless you are putting out massive numbers. 2.5" is also too big for most of us.

My dad's bud at work, has an 06 'balt SS/sc and is running 7.7-7.9' in the quarter and has a 3" exhaust. He had a 2.5" until he reached 10's, still street legal.

He is running a twin turbo setup and virtually everything is custom. He has never put his car on a dyno but he guesses he has about 1200hp at the wheels. He said he is gonna try and qualify for pro stock this coming season. And if any of you watched the PIR Pinks all out he was on there for a second or two, but he was running too fast for the group they chose.

He told my dad that for our lowly cobalts 2.25 should be fine to about 300whp, 2.5 to about 450whp, and anything above that 3". These engines love backpressure.

Just some info coming from a hardcore cobalt enthusiast.

 

any pics or vids of this beast?

 

Actually I've never seen his car or talked to him in person, but like I said he is on Pinks all out. He also has a low 8 sec Nova. He's one of those guys that does real estate to make his millions, but works at a car dealership for fun. Kinda confusing huh.

He is in close contact with GMPP a lot. He actually had some GMPP reps looking at his engine because they couldn't figure out how he was able to build such a fast car in less than a year without sponsorship. My dad told me that GMPP took extra interest in his custom header. He doesn't know if they might make a mass production header or not, but they took a lot of pictures and measurements. Not to start putting out rumors or nothin.

 

twin turbo set-up, 10 sec 1/4 and running a 2.5 exhaust...................... interesting how ppl on this forum have different opinoins than seemlying everyone else.

the HP is BHP

 

Wow, I never saw this thread before somehow. I dynoes at 217/188 stock, and 221/190 after the GMPP performace exhaust, but it was on different days. Maybe I have been underestimating the gains I got from the exhaust.

 

I love how it starts at 2.5 liters Where'd you get that chart, cause I'm pretty sure it's talking about V6's and V8's, maybe a couple of i4's but obviously his 2.0 falls outside of your chart.

When he was running 10's it was a single turbo by the way.

 

dude im not knockin ur dad's friends set-up but every person i have ever talked to and every bit of info I've ever read about turbos talks about big ass exhaust systems or none at all.

BTW the chart wasnt in response to that TT balt rather a reference for ppl trying to decide the size of exhaust they want. 2.0L + m62 = 3.1L but that doesnt matter as much as how much HP ur making, so the liters in the left hand coloum can be excluded

 

Okay lets talk HP. My 450hp 550tq GTO had the purple hornies that narrow to 2.5". Explain that one, eh.

 

dual, notice how theres a column for that.... and N/A im guessin

 

Yeah dual says for 450 hp, 3" not 2.5" c'mon man know what your chart says or don't post it.

All I'm saying is that paper can say one thing, real world is totally different.