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Nope, Custom made is our only choice, They don't flow all that bad. If your willing to get a tune, Kill the cats and get a nice smooth downpipe.
 

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Nope, Custom made is our only choice, They don't flow all that bad. If your willing to get a tune, Kill the cats and get a nice smooth downpipe.

There is a header made for the G6 but it wont be legal as it does away with your cats. OBX makes one that fits the LX9 3.5. You would need a tune for it as well. Im not sure if it will fit an 07 3.5 though....Isnt the 07 a LZ4?
If so then it wont fit.

 

· Mobile Audio Specialist
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There is a header made for the G6 but it wont be legal as it does away with your cats. OBX makes one that fits the LX9 3.5. You would need a tune for it as well. Im not sure if it will fit an 07 3.5 though....Isnt the 07 a LZ4?
If so then it wont fit.

WTF!!

you can always add cats, and yeah and yo would nead a tune
 

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To prevent the CEL always staying on....
Yup, But like I said you can add aftermarket cats, doing so will prevent that.or you can tune them out with an tune.
and the backpressure release from no cats
would make it lean.....correct?
Would it make it lean? I doubt it, Back pressure usual affects torque, but even then i don't think it would hugely affect it oh and doing the exhaust(form the cat back) would mess with the backpressure more than messing with the cats
 

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How much torque effect would there be if someone opened up the exhaust with a catback?
 

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Hmm. I noticed a difference with my custom catback. My mpgs skyrocketed and now i can spin wheels!
 

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There is a header made for the G6 but it wont be legal as it does away with your cats. OBX makes one that fits the LX9 3.5. You would need a tune for it as well. Im not sure if it will fit an 07 3.5 though....Isnt the 07 a LZ4?
If so then it wont fit.

http://www.tuningdepot.com/ebay/images/11229-3.jpg
Most 3.5's engines are LZ4's (2007-present Pontiac G6 )

But if you have 2005-2006 Pontiac G6 Sedan / Coupe or a 2006 Pontiac G6 GT vert you have a LX9

Thess headers will fit the LZE engine too.... They are the exact same engine as the LZ4's except for the fact the LZE is flex fuel capable and thus a Lil under tuned.

I might pick these up for my car I'm 100% the back header will fit, however the front header will bolt up too but the pipe connecting the two will be an issue....
 

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LOL.....Now was that a placebo affect? are your tires bald? LOL think about that :cool:
What else would you expect with conti's?
 

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:shrug: do a before and after dyno and tell us.... maybe 1or 2 I wouldn't expect anything crazy but the increas in Hp would be worth it
idk if you know this or not but hp is a calculated number. when your torque goes up, your hp goes up(unless you dramatically change your powerband)...let's do some math...

(Torque x Engine speed) / 5,252 = Horsepower

let's say we have an engine with 100 foot pounds of torque and the highest point of the powerband is 6,000 RPMs

(100 ft/lbs x 6,000 rpm) / 5252 = 114.24 HP

now, lets add 2 foot pounds and see the difference.
(102 ft/lbs x 6,000 rpm) / 5252 = 116.52 HP

let's say we tune a different engine with higher RPMS, but with the same amount of torque
(100 ft/lbs x 10,000 rpm) / 5252 = 190.4
(102 ft/lbs x 10,000 rpm) / 5252 = 194.2


this is how F1 cars and go-carts have so much HP with tiny engines. the cylinders of an F1 car are the size of a pop can. your dad's old muscle car has pistons twice that size(if not more), but only has a fraction of the hp...

the hp went up quite a bit, but the torque stayed the same. the hp gain from 2 pounds of torque was as minimal as before...so if you only gain 2 pounds of torque from a catback, you'll be lucky to gain 4 or 5 hp. don't get me wrong, 5 hp is 5 hp. it's better than nothing and your cat-back will eventually pay itself off(via better MPG's)...so don't expect a huge gain from doing such a minor mod.

if yall already knew all this, sorry for wasting the space :p
 

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I have a 2007 Pontiac G6 GT and I have a Magnaflow catback exhaust on it and I was wondering if there was anyone who makes headers for it or not?
I see you're from Indiana. If Dayton, OH isn't too far for you, there is a guy there who runs a shop that is looking for a 3.5L to make some headers for. You'd have to leave your car with him for like 3 weeks or so, but if you are interested, PM me.
 

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Does the 3.5 lx9 05/06 g6, & 3.5 lz4 07/08 g6 exhaust manifold have the same line up pattern off the block, i kno the obx headers for the lx9 bolt up flange is different from the lz4 is that really the only
Difference so i can fabricate to fit wit custom welding or is it much more to it, dont wanna get super expensive for just 10/25 hp headers
 
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