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Old 05-28-2009, 02:30 AM   #35
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Are those CAT's inbetween the O2 bungs? They seem very small if so.

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Old 05-28-2009, 02:39 AM   #36
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Quote:
Originally Posted by davidj View Post
Are those CAT's inbetween the O2 bungs? They seem very small if so.

high flow cats i think...
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Old 05-28-2009, 07:46 AM   #37
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From what I understand, it is illegal to mess with the CATS, i.e., can't move them. I don't see how this would not be considered moving the CATS, therefore, fail inspection if the inspector takes the time to visually examine the underside.
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Old 05-28-2009, 08:08 AM   #38
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Most if not all long tube headers are considered "off road" and will never have a CARB #. Take a look at the recent edition of GMHTP and Chris Werner's article on header upgrades to his 4th gen SS. He explains that the length of the tubes, which moves the cats back, causes them to fail cold-start emissions since the cats take too long to heat up. If you live in an area, oh say like the Shenandoah Valley of Virgina, where there are no emmisions tests then this is not an issue.
Regardless, these look like a very nice setup with some nice power gains.
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Old 05-28-2009, 08:58 AM   #39
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Old 05-28-2009, 09:13 AM   #40
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WOW!!!! more increase than what I expected!!! I was planning on getting these anyway but this just sealed the deal. Im sure the price is going to be up there but I think it will be well worth it. Great Work!!!! I cant wait!! The only reason Im buying aftermarket exhaust is for the sound!
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Old 05-28-2009, 09:26 AM   #41
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Install

any comment on how hard they are to install? DIY?
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Old 05-28-2009, 09:33 AM   #42
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Quote:
Originally Posted by Edrock View Post
From what I understand, it is illegal to mess with the CATS, i.e., can't move them. I don't see how this would not be considered moving the CATS, therefore, fail inspection if the inspector takes the time to visually examine the underside.
Then do some shopping around.. Your average mom and pop garages are more up tight than most dealerships. you can go to places like Pohanka Chevrolet, and they will do the emissions test with the standard process. If it passes, it passes. If it fails, it is because something needs fixed or replaced.
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Old 05-28-2009, 09:34 AM   #43
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any comment on how hard they are to install? DIY?
It takes me 7 hours to install long tubes on a 93-2002 F-body. It looks like the clearances on these cars is better. So it should be easier.
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Old 05-28-2009, 09:40 AM   #44
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Please PM me prices for emissions legal system with Cat's and all O2 provisions. Thank you.
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Old 05-28-2009, 09:47 AM   #45
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Looks like unbolt and rebolt. From what some have said, there's a ton of room engine bay on the new camaro's. Which is a blessing for long tube header installs. If you have floor jacks and a wratchet set, you should be good to go.
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Old 05-28-2009, 09:51 AM   #46
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Legal in Virginia? :[
Im sure we'll be fine. If some jerk at the inspection station is so concerned about your exhaust that he's gonna look under the car, you have a bulge just passed the headers... that means you have cats.. and you're fine.

It's not like they have pictures of the stock exhaust system to compare yours to. You can tell them that they are the factory cats cut from the old exhaust and welded into the new one. They cant prove it otherwise.

Now if your county has the sniffer, I hope you pass the sniffer. But if it makes you feel any better, I had a 2001 Cobra with Bassani catted x pipe and bassani catback and it passed CA emissions with flying colors. We should be fine on the camaro in Va.
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Old 05-28-2009, 10:21 AM   #47
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i talked to someone at arh the other day and they said with their headers and x pipe setup there was really no need for aftermarket mufflers as the stock ones were pretty much free flowing and the only reason to go after market would be to make your car LOUD

Or for removing like 40lbs of useless weight and the terrible underhang.
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Old 05-28-2009, 11:08 AM   #48
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AWESOME GAINS! To the OP's post earlier - where the pipes neck down to about 2.5'-inches is the merge collectors ARH use. QTP is the only other major company I know of that use these collectors standard. These promote scavanging of the exhaust by keeping the velocity of the gases as high as possible. Kooks has something similar on many of their LTs, but they're not quite as good, from the looks of them (they have true high velocity merge collectors for an additional cost though for some models, last I checked). Anyhoo, these are great gains! I didn't really think they'd be this high, but considering the numbers - WOW! Has ARH mentioned if they are going to offer additional sizes and stepped primaries for the 5th Gen too?
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Old 05-28-2009, 12:29 PM   #49
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So is it OK to run long tubes w/o a tune? I know it would benefit from a tune but it was my understanding that to compensate for the better breathing a tune was necessary with LT's. Oh and great looking headers, a set just might be in my future
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Old 05-28-2009, 01:00 PM   #50
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If you spend 1k plus on LTs you might as well put down the 300-400 to get a tune and the extra 20 HP.
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Old 05-28-2009, 01:31 PM   #51
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What were the before and after dyno #'s? Maybe I missed it..
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