i tried 3 different cat back systems on my 88--coupe..
the first 2 caused a cloud exhaust vibration inside the car.. talked to the
guys at Corvette Central and they recommended Magnaflow cat-back system.. no
EXHAUST - CAT BACK WITH LT1 TIP MANAFLOW part #324136 cost $324.95
on her for a good 10 years before selling it not long ago...
I had actually purchased a cat back system and when I started to
install the system I stopped after I had removed the original
mufflers...just to start up the car to see how it sounded without the
Well at idle it sounded almost stock...under moderate throttle it
sound good, under WOT it sounded great... End result I returned the
cat back system and installed the eliminators with the tips....
Car did not have excessive resonance on the highway...never a problem
have a conversation with my wife... and it always passed the emission
When I sold the car I gave the new owner the original mufflers &
tips... told him it was his choice...
64 72 & 98 Rag tops
76 & 79 Coupes
TUFF TUFF Car to get sounding great like the dozens of frikkin Mustangs
we hear every day..... LOL
The way the pipes travel down the trans tunnel it sets up resonance very
and seems to be worse in the ragtop.
I tried the B&B TriFlow complete system (rubs fingers together $) and it
lasted on the car
exactly 2 days and was shipped back... Had a droning idle and got
QUIETER when rompin on it.
And had terrible resonance right at the RPM used on the highway and
I've yet to hear with my own ears anything C4 I'd put on. Still waiting :-)
When my buddie get's back from England (green card issues), he has
a complete shop with lift and TIG, MIG. I'm thinking about finding
a junkyard C4 system (1 piece no clamps at the rear bends, I HATE the look
of those clamps) and cutting the tops of the mufflers off removing the guts,
MIGING in a straight pipe to connect the inlet to exit, MIGING on the
so it looks stock but has the Muffler Eliminator sound..... I don't like
to looks of the
muffler missing back there.
I put the Magnaflow catback on my '86 about a year ago with the
cat/converter gutted out and like the sound but feel the cockpit is a
"little" loud but o.k for conversation (I don't have to YELL: ) THe first
couple of months the system seemed to clear out black dust which ended up on
the back of the car and had to be constantly cleaned. I'm not sure if it
was the gutted converter or new Magnaflow system but may have been the
former. I do like the sound and looks of the stainless steel pipes which
are easy to clean.
Thanks Troy and Bob. Mines an 88 and the 324 price tag is not too shabby
when compared to 1000+ for something that would be to noisy. I am however
anxious to see what it sounds like when I do remove the mufflers. Makes
sense, if you leave everything in place, the resonance probably "sets up" on
the trip down the tunnel. If the exhaust makes it to the rear (mufflers)
without annoyance, then maybe it matters not what you put back there.
Thanks Dad for the URL. I'll read it over and see if it's feasible for my
garage. I would love to tack on a few horsies to the 245. BTW you owe us
an apology for the crack about C4's and junk yards. My crummy C4 shines
above the best of stangs. ;-)
You need to tell me what's wrong with my Mustang, 65, Wimbledon white, blue
interior, huge 200 CID six with three on the floor. Promo car with a special
price of $1965 with all of the 64 1/2 goodies except the 2 number code for
interior color, darn.
All kidding aside I have the tools, the lift, and the MIG welder to do that
job, bring it on, we can make it purr.
Look on ebay and see what people are selling..those are the after market
ones to avoid.....Borla etc..create so much resonance that after one or two
days they are history..Resonance is the problem not the exhaust tone
...drives you crazy at normal highway speeds. Sold mine at 50% loss after
one week...lucky I kept the original mufflers..and did the installation
myself. I have my own lift in a three car garage.( Most of the new homes in
our area have three car garages and some have 3+ a motor home garage with 10
'91 C4: I used Flowmaster replacement mufflers - "American Thunder"
series, I think. I'm very dissatisfied with them. The resonance at
cruising speed overpowers everything and even makes interior parts
rattle. They get quieter at higher RPMs and the full throttle sound is
I had an '87 C4 with a chambered exhaust of unknown origin that sounded
really good. Wish I knew what it was. It was supposedly factory
installed but I've never heard of that elsewhere.
enuf. A local muffler shop did a 'temporary fix' with a pair of used
resonators taken off a Lincoln limo conversion (this is no-s**t folks).
The 'temporary fix' has been on the car for over 5 years. I finally
had tips added to the exhausts making it sort of permanent. At WOT this
C4 sounds more like a city bus than a free flowing sports car.
Has anyone found an exhaust system that provides a nice rumble ('60s
glaspak sound) from idle to 35 mph then quiets down above 1800 ? A deep
rumble in creeping traffic would be nice and I'd like to cruise at 70-75
with mostly tire noise. Muffler guy claims that he has never been able
to produce that sound on a C4 without removing the CAT. Which, seems to
be how this thread is evolving.
'89 Hookercar '02 e-blu coupe
We're back to the CAT thing again. I'd like to cut mine off or at least gut
it to stop the bloody rattling :)
There seems to be different school of thought regarding the CAT. I was
told I'd have to 'chip' my car if I wanted to replace the CAt with a
straight piece of stainless steel.
BTW, I have a Dyna-Max exhaust? It was on the car when I bought it so I
don't know what model it is. Sorry. I love the sound at any RPM and it
isn't too noisy in my convertible. And yes it has a nice deep rumble when
crawling in traffic.
You do NOT have to change a chip...just look up google and buy a $40 "ss
test pipe"....don't listen to idiots that don't know what they are talking
about...you will have NO problems except a bit louder exhaust....( REMEMBER
FOR OFF ROAD USE ONLY )..next these experts will be telling you that you
need to change the chip every time you replace a light bulb or clean the
Thanks Vette Guy. You are going to laff at me for sure, but I don't
get the (REMEMBER FOR OFF ROAD USE ONLY) Does that mean you wouldn't
reccomend replacing the CAT with a straight pipe unless it's for track
use only? I don't race my Vette and it's just for everyday driving.
Is this still an option for me? My apologies for being 'noobish' :)
a legit shop can't put one on and let you out the door. Put a catalytic
converter on it and forget about it. An after marker converter isn't that
bad price wise and you can get a high flow while you're at, the labor is the
same both ways. I tried the "test" pipe once and then went back and did it
right to get it to sound less ugly.
On 26-Apr-2006, email@example.com wrote:
He means to be street legal you should have cats. IMO a little back pressure
is a good thing anyhow. Also sound wise it's better to have cats or a
resonator especially if you have no mufflers. But I'd pick one or the other.
If I were to put mufflers on my C5 the cats would be history.
I'd be greatfull for a lead to a dyna-max cat back system.
BTW Dad, that system is too complicated for my schedule and budget. I'd be
tempted however if you resided relatively near me. (SF bayarea)
??Would you be the same "old dad" that was popular in this group back in the
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