My exhaust comparison L98 Flowmaster, Magnaflow &Headman Elite.to stock LT1 (videos)

[Ch@0s]

I upgrading my L98 exhaust to Magnaflow cat back.
My current exhaust is stock with Flowmaster 40 series and TPIS YPIPE.
In this is the thread I will compare them with videos and pics.

Edit: I went from This exhaust to Stock Lt1 exhaust and plan on going with Magnaflow 3" SS Lt1 catback so stay tuned.


Here is the new exhaust

[Ch@0s]

Here is the first video.
Stock exhaust with Flowmaster 40 series 2 chamber and TPIS Y-pipe.

YouTube - Stock with Flow 40s.AVI

[Ch@0s]

I have the headers on now.
I have put on a lot of headers in my time and never had any that bolted up and fit perfect until today.
I took the plugs,wires, and starter off. I took the S-belt off and the 4 long screws that hold the A/C compressor in place and moved it. The drivers side slid in from the top easily. The passengers went in from the bottom just as easy.

[Ch@0s]

Now that the headers are on its time for a open header video

YouTube - 91 C4 corvette open heders.AVI

[Ch@0s]

I got the Ypipe mocked up today. I used the stock y with the flares that came with the Elite Headers. I simply mocked them up and cut the ends off. I will have them welded by a shop.


I used a Skill saw with a cut off blade. It worked very well.

[Ch@0s]

It's on, man it sounds great!


Here is the video

[Ch@0s]

OK guys here is the Headman long tubes stock rear y and Flowmaster 40s.
The next video will have the Magnaflow on.


http://s102.photobucket.com/albums/m118/lorddemoya/?action=view&current=C4HeadmanHeadresFlowmaster40s.mp4

YouTube - C4corvette FLY BY fast Headman Headres Flowmaster 40s .AVI

[Ch@0s]

I have the Magnaflow on now guys, I love it. It's quieter while cruising but has a great performance sound when I'm in it.

YouTube - C4 Corvette CC502 cam Headman Headers HSR Magnaflow Stainless.AVI

[Ch@0s]

No torque loss .. did a dyno run recently, I put down 268 HP 312FP to the wheels that's almost 400 foot pounds at the crank and the run was aborted because of a downshift ..
They are long tubes and IMO the best bang for buck mod for a L98.

YouTube - Dyno Video 1991 l98 c4 corvette cc502 cam HSR intake

[Ch@0s]

Ok, So my new Fast Burn head ports were way to big for my Headman headers. I sold those. My idea was to get some TPIS long tubes and 3" magnaflow cat back for a LT1 and use some bullet cats with a Xpipe. I would have to wait about 6 months to buy it sooo.
I was browsing and found some take out LT1 exhaust and for less that $170 I now have this exhaust including hangers. I measured the ports on the manifolds and they match almost perfectly.



I cleaned them up with 100 grip wet and sanded the Mufflers with 400 to paint.

[Ch@0s]

On an LT1 oil filter adapter is offset make room for the monster cats.








I sourced some replacements with bullet cats on the popular auction site.
$314.00 shipped.

[Ch@0s]

Thanks to Socalman for this info.

[Ch@0s]

I put the hangers on this afternoon. The front hanger bolts in the same place the L98 transmission hanger goes. The rear bolts to the botom 4 bolts on the backside of the rear end. I had to enlarge the holes in the rear hangers.

The hanger on the left has the holes enlarged. The one on the right is the stock size.

[Ch@0s]

I have the cat back on it fits nicely. I'm waiting for My POR-15 for the manifold then i will put them on.

[Ch@0s]

Ok I got the rest on. Here are some pictures.

I had to bend the heat shield a little it was hitting the steering.


It hits the stock oil filter so i will need to get a shorter filter. The PF454 is the same as the stock filter but 2" shorter.



The passages side fits nicely. I now realize i am missing the hanger that bolts to the trans there.



I will get some better pictures when I can get it running and on the ramps. I think it fits great.

[slrvette]

Looking good!.. keep up the good work.

[Ch@0s]

It's ready to run.I'm just waiting on my tuner to come over and give me a street tune.

[PLRX]

Jose, FAIL, No hardcore take-off video.

You know we want to see something leaving two long black marks on the asphalt.

I remember the days when Ch@0s did it right.

[Ch@0s]

Originally Posted by PLRX

Jose, FAIL, No hardcore take-off video.

You know we want to see something leaving two long black marks on the asphalt.

I remember the days when Ch@0s did it right.

Still waiting

[Midnight85]

Sounds good, let's see it when it is tuned. I put a total of 6 different combinations on mine, they were either too quiet or too loud. I finally settled on Magnaflows too because they were the only muffler that didn't have unbearable drone. I built my own system, coming off the headers into two hi flow cats, then an x-pipe then back into the tailpipes with universal Magnaflows on the rear in brushed stainless. A true dual system with only the x-pipe tying them together.