exhaust question

[roadwarrior65]

will the pipes and muffler for a 89 riviera fit my 89 reatta? I just need the tail pipe, muffler, and the pipe before the muffler..... thanks in advance

[Guest F14CRAZY]

As I understand it, yes. Only difference is that the Rivi exhaust pipe is longer and will have to be cut off at the end.

[Vincent Vega]

The intermediate pipe is longer. The bracket is in the wrong place too. It does have the correct bends.

[Guest crtnrds]

How about the diameter?

[Vincent Vega]

I'm pretty sure that is the same. Mine already had the cc replaced. They do sell adapters to make it fit together.

[2seater]

The Riv muffler will be a single outlet also. Not really a problem, just looks different.

[Guest crtnrds]

How about a Camero muffler with the single inlet & one outlet on each end. Anybody know if that will fit?

[Barney Eaton]

I did a tech article in the Spring Reatta newsletter on Reatta exhaust.

You can view it at www.reatta.org under newsletters

[Richard S]

Any decent muffler shop can fabricate a dual exhaust set up using the Camaro single inlet dual outlet muffler. Does not seem logical that inlet and outlet ports would be interchangeable for a baffled muffler so I disagree with that part of a previous post. Camaro mufflers come in a wide variety of resonances so be a little careful unless you want a real growler. I initially got ahold of Flowmaster at a swap meet, but the installer said I wouldn't be happy with something that loud. We worked out a deal whereby I exchanged the Flowmaster for a generic Camaro and all the labor. The only thing I did was modify the lower panel cutout for duals, and come up with a pair of Borla tips for $20 off ebay. I like the look much better than stock.

[Guest crtnrds]

Not to hijack your thread, RW65 but while on the topic of exhaust, does anyone know if the 3800 Series I exhaust manifold has the same restriction (mentioned in Barneys' article)as the Reatta? Do all 3800s have this restriction?

[Barney Eaton]

I believe that all 3800 V6 between 1988-1990 have the same exhaust manifolds, regardless of the car they are in and the restriction shown.

[Guest MauiWowee]

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I believe that all 3800 V6 between 1988-1990 have the same exhaust manifolds, regardless of the car they are in and the restriction shown. </div></div>

AHA, so my 1991 does not have the restriction? <img src="http://forums.aaca.org/images/graemlins/shocked.gif" alt="" />

[Guest F14CRAZY]

I'll look at my '95 L67 manifold tomorrow

[Barney Eaton]

Yes the 1991 manifold has the same restriction. In my earlier answer I was only thinking about the "C" series engines... the "L" engines have the same problem and I don't know when the manifold was changed...possibly with the series II engines.

[Guest crtnrds]

I was referring to a '95 series I S/C manifold. Waddoyasay F14?

[Guest EDBS0]

GM Ross has a dual outlet muffler.

One outlet in the stock position and the second on the right hand side of the car. the outlets are symetrical along the centre line of the car. It looks good! Search, he has posted pictures

[roadwarrior65]

Thanks for all the feed-back on my exhaust question. The muffler shop wanted 385 to replace from the converter back. I was still recovering from my sub-frame problem, spent about 500 total to get that back togeather, came out great, so I went with the riv. exhaust. spent 118 total and it went togeather great, just had to cut off the end of the tailpipe. it took me about 1 and half hrs. I've had alot of cars in my life and can't explain why I love this car so much, but its the best front wheel drive car I've ever driven... it almost makes me forget about the 69 camaro's and the 72 cuda and the 72 gto that I've had.......................almost...)

[Guest MauiWowee]

Greg's pipes do look good. Something else on the future possible list. <img src="http://forums.aaca.org/images/graemlins/cool.gif" alt="" />

http://photos.aaca.org/showphoto.php?pho...=529&page=2

[Guest F14CRAZY]

Uh, it seems I forgot about checking the manifold before I went up north for the weekend. Blast! Keep bugging me about it though. I dunno if the L67 manifold would be any better at all compared with the stock LN3 manifold (that is, with the restriction removed).

[Guest EDBS0]

The color of my first Reatta, I love that color, what is it called?

[Guest EDBS0]

these guys made my muffler and outlet pipes, custom from scratch. Excellent result. Are you close?

[Guest crtnrds]

It's about those L67 exhaust manifolds, F14. Restriction or no?

[Guest F14CRAZY]

god gummit, you reminded me again <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> -grabs camera phone and goes outside-

[Guest F14CRAZY]

It seems the L67 manifold DOES NOT have the restriction. Outlet still looked to be 2'', though I should have measured it. 2.25'' maybe?

Does it look like it would bolt up? Don't know if it's worth the bother though to swap the entire manifold; may be better just to remove the restriction

[Guest F14CRAZY]

Sorry, I moved a little too early in the last photo. Was trying to show the bolt pattern for the manifold.

[Barney Eaton]

I believe that Hal (2seater) said the head bolt pattern is different on the later 3800 engines.

[2seater]

I am not sure about the bolt pattern. I am pretty sure all of the Series I engines, '91 and up are the same as the vin C engines, but I have not tried it personally.

[Guest F14CRAZY]

I'd bet they're the same, from all the other similarities I've found between the LN3 and L67. Do you think there would be any performance gain, aside from "the restriction"?

[2seater]

I don't think there would be real performance advantage unless the basic design is better. The front manifold is actually pretty good. I think some of the later model guys that have a cast iron front manifold are switching to the tubular one and picking up power doing so. The rear manifold needs work beyond the restriction. Removing the restriction helps, but that point on the rear manifold appears to be particularly turbulent where the exhaust from #2 & #4 run into the exhaust from the front and #6. A longer outlet neck with the front and rear exhaust merged more smoothly is a pretty common thing on aftermarket headers. Without changing the length of the outlet and keeping the stock design, (an downpipe), my logic indicates useful gain could probably be made by cutting the "tee" junction and installing a portion of 90* elbows back to back to provide a better guide for the exhaust toward the outlet rather than running directly into each other. One of my future plans to test on the flowbench, but since my manifolds are now completely different than stock, it went on the back burner.

[Guest crtnrds]

2Seater- where might I find pictures & info on your turbo set up?

[Guest F14CRAZY]

Check out page 2, I think, of the "Readers rides" at seriesoneperformance.com

[padgett]

I always felt that the front pipe was pretty good but then should wrap back to a collector next to the head pipe and the rear manifold could benefit from a major rework. Anything decent would probably require removal before you could pull the engine.

Keep in mind that the "C" engine is pretty near design limits in many areas and just is not going to breath very well without some major massging in several areas.