MostWanted

I was told that the stock exhaust pipes on our LT1/LT4s only look like 3" diameter pipes but actually have another smaller pipe inside of them. Since I have never taken my exhaust apart, I do not know if this is true or not. (I am waiting on my Magnaflows to arrive for installation) My common sense tells me that is CRAP! And how about the factory resonator, what does it look like inside? Does the "H" pipe or "X" pipe replace the resonator? What are the benefits? Thanks. :thumbs:

VR'92

That is bull crap and a half. I have sawed through a couple of stockers. The are what the appear to be. :yesnod:

wake

Not sure about smaller pipe, but I thought they were 2 3/4" pipes and necked down to 2 1/2 at the muffler, and maybe at the resonator if I remember correctly...

comp94

torch i dont know where you are getting this info from but it is bull. as victor said above the pipes size are what they apear to be

want2drivemy85

i dont know about the newer ones, but the older ones, like my 85 have what you describe as an inner pipe. the front 'y' does, i hacked into it last week.

88vettelover

It's called double-walled pipe, and it's very common on foreign cars, especially Honda.

I don't remember seeing that on any newer Vette that I've done.

Plus, once you get passed 2 1/2 pipe, there is very little if any difference between that and 2 3/4 and 3 inch.

GR8FUL1

Yes this is :bs And I can only tell you that at first I only replaced the mufflers on my 96 with Magnaflows. It kinda sounded annoying at cruising speeds. Then I had the resonator removed and replaced with straight pipe and a H or crossover up by the transmission. It now has a deep mellow tone and I love it. Hope this helps.

MostWanted

Thanks for the info guys! My Magnaflows should be waiting for me when I get home. Too bad the engine doesn't arrive at the shop until tomorrow. :thumbs:

pwrful c4

:iagree:

Nathan Plemons

Yup it's :bs It's 2 3/4 that does neck down to 2 1/2 at the mufflers and resonator, so effectively it's a 2 1/2 inch system.

89stock

i have an '89 with the stock system, anybody know if i'm being robbed of power to?

HeeHaw89

YES - The stock L98 exhaust is more restrictive than LT1 exhaust.
If you plan to mod your vette its the best place to start.

Nathan Plemons

:iagree:

The L98 system has pre-cats which goes into a single pipe through a cat, back into dual mufflers.

The LT1 has dual cats, into a center resonator, which is two pipes, back to two mufflers. The LT1 is a much better flowing system from the factory.

bogus

there are high flow cats that will help you out a ton...

the pup cats are not the real problem, it's the big one in the middle!

overall, the L98 exhaust is smaller and much more restrictive.