OBX cat-back exhaust
 

Looks like OBX is getting into cat-back exhaust too. Looks a lot like Corsa.

http://www.ebay.com/itm/OBX-Dual-Cat...item256914093f

Re: OBX cat-back exhaust
 

nice price for a Corsa system.. LOL

Looks like Corsa anyway

Re: OBX cat-back exhaust
 

That set up in a TRUE 3" would be the ticket.

Re: OBX cat-back exhaust
 

Wow. That's an insane price.....

It does look like Corsa!

Yun, are you buying it????? I can't wait to inspect it

:cheers:

David

Re: OBX cat-back exhaust
 

Nah... I am splicing on a Magnaflow w/ LT1 tip.
It seems someone who knows a lot about ZR-1 is advising OBX. Them boys know what we like.

Re: OBX cat-back exhaust
 

Wow looks very Corsa-Esque

Did they "Borrow" the stock photo lol

Re: OBX cat-back exhaust
 

Has anyone pulled the trigger on a set of these yet?

Re: OBX cat-back exhaust
 

any idea on how these sound/flow?

Re: OBX cat-back exhaust
 

At 6000 rpm, 1st gear, factory registered 1.4-1.5 psi. OBXregistered about 1 psi.
As for the sound it's very mellow.No resonance at 6th gear crusing.
I am very pleased.:cheers:

Re: OBX cat-back exhaust
 

How does the sound compare to a Corsa system?

Re: OBX cat-back exhaust
 

next time i'm in dc i'd love to hear your car

Re: OBX cat-back exhaust
 

Did you hook them to stock manifolds or after market headers?

Re: OBX cat-back exhaust
 

wow that seems cheap. Is the quality ok ? I might have to pull a 3rd shift and get this..I also see they have the ZR headers too..
http://www.ebay.com/itm/OBX-Exhaust-...item2317995684

Re: OBX cat-back exhaust
 

Jeff - I think OBX is less raspy and more mellow, bassy sounding. About the same or less loud.

Kevin - next time in DC area you are more than welcome to drive my car.

MikeGolf - I am running OBX headers.

Corbusa - quality is as good as OBX. The whole system is polished SS.

Re: OBX cat-back exhaust
 

Would they hook up with stock manifolds? Thanks for the help but for the price it makes you wonder. I will do the headers later in year but with the coating and everything, I'll need an exhaust system first.

Re: OBX cat-back exhaust
 

Yes it will hook up to the factory system - at least it would have for my 94. Driver side will hook up with 3 holed triangular flange and the passenger side will mate w/ 2-3/4"diameter pipe (factory size).

Re: OBX cat-back exhaust
 

I have a few questions about the exhaust systems .. The OBX system for sale, will it fit right in place of the factory system or is major mods necessary ? When I do get the headers is there major mods needed there? Especially to hook up from the header flanges to the new system? How does it connect to the cat(s) or resonator..
Which part of the factory exhaust is the most restrictive ? Are factory old cats hard to get or expensive? I was thinking of getting old ones to hallow out so it looks correct yet can breath.. Any suggestions is appreciated..
FYI I am working day and nite to get my vette paid off asap.. But when cheap good mods come available I'll do what I can to get them and set them back for later.. any and all advise it really welcome...

Re: OBX cat-back exhaust
 

First my comments are based on my experience w/ 94Z. I believe 91 and up are close.

Both headers (OBX and SW) and cat back exhausts (Corsa and OBX) are designed to replace factory exhaust manifold and factory exhaust independent of each other - meaning connection points are maintained so the headers or the exhaust will mate to factory connection points and match the factory connection type (3 holed flange on the driver side and slip joint at the passenger side).
Both SW and OBX system does not account for cats. Factory manifold has cats very close to the runners. Headers, in order to maintain separation between individual exhaust ports, runners do not converge until the collector. If you need to splice in cats, cat has to be added after the collector. This means for SW, cat back exhaust has to be modified to splice in cats. However, OBX header collectors are about 12" closer to the motor and after the collector has a glass pack that mimicks spun metallic cat that slips on between the header collector and the exhaust. These pieces can be used as a template for metallic cats to be modified for splicing into the system. Also, this 12" closer to ports configuration would help in lighting off the cats and keep them hot.
As for which part of factory system is the most restrictive, answer is the rear mufflers at least for the later exhaust system. Early factory exhausts are restrictive starting w/ connection into resonators (a piece in the middle of the car).
If you intend to hollow out the factory cat for visual go with OBX. OBX already includes glass packs that visually look like aftermarket metallic cats.
Call me if you want to discuss or need more info - 703 980 8814.:cheers:

When I get a chance to get my car on the lift I will take a few pics and post.

Re: OBX cat-back exhaust
 

Though it worthwile to add more detail:

I modified my exhaust in stages namely due to financial restrictions.
First mod was removing the factory exhaust manifolds including cats and installing OBX headers to factory exhaust - hp and torque increase was immediately noticiable accross the entire rev range. At idle the car sounded the same w/ factory system and at about 2000 rpm became slightly louder.
Then, I bought a pair of Magnaflow mufflers ($259 at Corvette Central) and replaced the factory mufflers - exhaust became a little loder but the car developed droning in 6th gear that gave me a nasty headache. These were removed and sent back to Corvette Central.
Finally I saw the OBX at an incredible price and had to try it - high quality and no issue w/ install - system, including headers, is a little louder and I can hear the engine pulse. Definate power increase over header/factory system at higher rpm and yet quiet enough for a normal conversation and, most important for me, no droning in 6th gear!

I sincerely thank Jim and David for helping and putting up with me going through all these variations of exhaust combo.

Re: OBX cat-back exhaust
 

Thank You sir!, I'm going to see how quickly I can get started on mine.. I appreciate the info...

Re: OBX cat-back exhaust
 

This sounds very promising to me. I'll do mine as soon as finances allow. Ceramic coating?????

Re: OBX cat-back exhaust
 

Please beware I can vouch for construction quality and reduction in back pressure. But the sound quality (whether you like it or not) is a subjective thing.

Re: OBX cat-back exhaust
 

Not the exhaust system just the headers. The exhaust system is SS and doesn't need anything done to it.
:cheers:

Re: OBX cat-back exhaust
 

Seems there has been a lot of discussion with pros and cons on coating headers. Do we the zroners like it and or recommend it?

Re: OBX cat-back exhaust
 

I recommend headers to be coated. I have seen stainless steel headers after a couple of years of use and they do turn grungy looking. If not for heat retention resulting in hp gain, at the very least do it for cosmetic reason. For $350, at least for me, it's a money well spent considering typical 2 person 6hr (total of about 12 hours) work for installation. I prefer not to do it over.

Re: OBX cat-back exhaust
 

Well, here's a vote for coating...This is the way they will always look...

Rich

Re: OBX cat-back exhaust
 

Coat them

:thumbsup:

Re: OBX cat-back exhaust
 

Those headers are ceramic coated? Not what I expected. Thanks Scrrem, I think you just made up my mind.

Re: OBX cat-back exhaust
 

Me too, not what I expected either from ceramic, once I saw them, I had to have it done. I had Jet-hot do mine, but I'm sure there are loads of companys out there.

http://www.jet-hot.com/

Rich

Re: OBX cat-back exhaust
 

Ceramic coating......it really work's http://www.swaintech.com/

Re: OBX cat-back exhaust
 

What he said! Well worth it, :cheers:

Re: OBX cat-back exhaust
 

coated here, still look like that pic years later
There is a Jet Hot here in Tempe AZ

Re: OBX cat-back exhaust
 

Scrrem, That looks Great !!!! Dang I wish I could fit another side job in soon .. aahhhhhh !!!!!!!!! I want my vette to have the exhaust system.. I'm trying to get on the railroad , maybe I'll get lucky and get called soon :)

Re: OBX cat-back exhaust
 

First, Yun that was a very well written critique of the OBX cat back system. Thank you for the time on that one, you da man!

Second, I wear glasses but tell me the price is less than $400.00 ???? for an entire cat back system?!?

Or do I need to get new glasses?:o

:cheers:
Tom

Re: OBX cat-back exhaust
 

You don't need new glasses - $349 plus $55 shipping!

Re: OBX cat-back exhaust
 

Thanks for all the input. I kind of highjacked this thread. Looks like when the time comes it'll be OBX headers, ceramic coated and an OBX exhaust. Are those cats on the ends off the headers, or just something that will make the inspection guy think they're cats?=D>
Steve

Re: OBX cat-back exhaust
 

That thing immediately after the collector is just a glass pack disguised to look like metallic cat - hopefully tric inspection guys.

Re: OBX cat-back exhaust
 

In NH all that is required is a visual inspection.:dancing:flag:

Re: OBX cat-back exhaust
 

Really appreciate the information and feedback on this thread. I'd already bought the headers a while back, just ordered the cat backs to match :)

One question - when you get the headers coated is it just the header/collector or do you get everything done?

Re: OBX cat-back exhaust
 

I had the headers, collectors, fake cats and one elbow - basically everything that came as a part of header from OBX- coated.
One more thing, I did not like clamps that came w/ headers or the exhaust. I ordered, I think, 6 2-1/2" band clamps (for cat back exhaust) and 2 3" band clams (for header collectors) and one 2-3/4" band clamp for fake cat to sleeve for driverside - all from Torca Accuseal. Also, I used 2-3/4" wide band clamp for connection between the driverside header and driverside exhaust. These wide band clamps (for slip joint not butt joint) do not crush the exhaust pipe so that later on when the exhaust has to be removed for tranny, clutch, or other work, exhaust can be disconnected and reconnected w/ minimal hassle.