'91 ZR1 different Mufflers and Control Arms?

[Subfixer]

92 White, White #0448.

I bought it dead stock with 18k miles from the original owner. Still had the original gatorbacks on it.

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[Mr.Yuck]

Then were on the same page. I bought mine with 9,000 miles on it. The original owner already put rectangular LT1 muffler eliminators on it. I also have my original gy gator back tires with 9,000 miles on them.

The older I get the faster I was.

[secondchance]

I believe, starting in 92, all C4s including ZR-1s wer fitted with black rectangular exhaust tips. My 94 had rectangular tips from factory.

[Mr.Yuck]

Yes rectangular outlet mufflers started in 1992 on c4's (LT1's) but according to general motors corporation they were never put on a LT5's And there's no documentation in the general motors parts catalog that says different.

The older I get the faster I was.

[zyal8r]

I definitely respect all the knowledge in these forums and mean zero disrespect in this post. This is what I've seen and read:

Regular C4s:
- '84s had downturned exhaust, two circular tips per muffler
- '85-'91 had straight out the back, two circular tips per muffler
- '92-'96 had rectangular tips, one per side; incidentally, 4th gen Z28s had the same-shaped tips, '93-'02

ZR-1s:
- '89 prototypes had two square tips per side
- '90-'91 had two square tips per side
- '92-'95 had rectangular tips, one per side

The most interesting thing I've observed... I have a '96 LT4 I bought completely stock, and a '95 ZR-1 that is still all stock (5900 miles)... the ZR-1 exhaust (mine at least, and other rectangular ZR-1s I've seen)... is at a bit of an angle on each side. It's very slight, but noticeable. At first I thought mine was bent, until I looked at other ones more closely and saw a local '93 in person as well. Really weird compared to the stock exhaust on my '96! I have not, however, measured the widths of the LT1/4 vs. ZR-1 rectangular tips. They may be the same, and I wonder if the slight angle of the ZR-1 tips was to make them appear to fit the wider rear end better.

Mike

[tccrab]

I've been a ZR-1 owner for 20 years now.
Every last 1992 through 1995 ZR-1 I've ever seen has had the square tips.
I like them so much that someday I plan to cut the oval tips off of the Flowmasters I have on my Z and weld on the square tips.
I love the sound of my Flowmasters, just have never liked their tips very much. They are way better than the stock 90-91 tips, but still not optimal.

Crabs

[Mr.Yuck]

Just to make sure that I'm correct. We're talking about (LT1) style Rectangle tip mufflers.. is that correct?Screenshot_20231229_232428_Chrome.jpg

The older I get the faster I was.

[Mr.Yuck]

My point again STOCK OE exhaust GM only shows one exhaust and muffler for all 5 production years of c4 ZR-1's. 20231229_165154.jpg20231229_165242.jpg

The older I get the faster I was.

[HAWAIIZR-1]

Originally Posted by bradd15

My apologies if this is a dumb question but I have been looking at 90-92 years and I noticed in the underbody pics of a few '91's some have the rectangle muffler and some have the double pipes on each side.
Also, I see some control arms are black and others are silver.
Was this an option or part of a package or color combo?

Thanks for the information.

Brad

Here are my all original, stock mufflers on my 95 ZR-1. They come from the factory with rectangle tips. I?m not at home to show other proof of brochures etc. The later years did not have the dual square tips.

[HAWAIIZR-1]

Originally Posted by Mr.Yuck

All 1990-1995 ZR-1's stock mufflers had double pipes on each side

The older I get the faster I was.

Sorry, but that is not true. Here is another 95 ZR-1, check toward the end of the video.

https://youtu.be/-el21jCS7_A?si=iWtLyk7osn6tCJxh

Here is 94 ZR-1

https://youtu.be/VvBorFqRRd0?si=n3mM7TEYVSY4Ydk9

Here is a 93 ZR-1

https://youtu.be/kbb4m692sgw?si=JygMh6HQy8Iwt9Ce


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