LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Project "bad ass" TRUE DUALS underway. Please comment on my design.

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Old 06-04-2009, 11:13 AM
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Originally Posted by mdacton
I bet it wont pick up anything over a regular 3" system, or minimal at best. and it will be twice the weight.
Might be right. The primary goal here is to get rid of the 2K-3K RPM raspiness and (rata-tata-tata) that I get with the 3" y-pipe and the LT's. That sound is annoying to no end and after great research, nearly everyone who went TD's said there was no rasp. Everyone that had LT's, Borla said that they had rasp.

If I get any gains from the TD's then that will just be a bonus. Weight?

Plus the entire cost of all the materials will easily be covered by the sale of my Borla. So there will be little out of pocket for materials. Plus it has been fun to do.
Old 06-04-2009, 11:22 AM
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as long as your having fun then its all good.
Old 06-04-2009, 11:29 AM
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I will be going to dyno late Summer or early fall. We will see what happens.
Old 06-04-2009, 11:35 AM
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Originally Posted by mdacton
I bet it wont pick up anything over a regular 3" system, or minimal at best. and it will be twice the weight.
That's why mine barely make it to the 9"

-Dustin-
Old 06-06-2009, 09:40 PM
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Update:
Well I cant have the dual cutouts in that cavity under the right rear seat. The tuck up in their tight but the drive shaft will hit the pipes when the car is on jack-stands and the rear end drops. That wont do.

I have relocated them closer to the front where the cats would go if I decide to install them. So the way it works now, I can have cats and no cutouts or test pipes with cutouts.

Holy **** this has been a lot of work. I have about 6 hours roughing the pipes in with another 6 hours fine tuning them to fit the desired way. I ran out of L bends so now I am dead in the water till Monday. All thats left is to fab the pipes from the muffler output to the tips. Then its off to TIG all the joints.

I also ended up not running the left side pipe under the panhard rod like the Bassani due to the mandrel pipe radius not being tight enough. I ended running it along side the right side pipe through the factory location above the panhard rod. Took hours to thread that needle but got er' done.

I have also managed to use the factory mounts for all mounting points. Check out the pic of the right side muffler mount.

I did fire it up to hear the sweet music. Man this thing sounds fuggin awesome with no rasp and pop at idle like what I had before. It has a very deep tone like what I was looking for.

Here are the latest pics:



Old 06-07-2009, 01:20 PM
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Looks like you stayed with the magnaflow exhaust parts. You will not be dissapointed.

Deep muscle car sound without the annoying pop and crackles of borla or the restriction of a flowmaster. Best of both worlds IMO.
Old 06-07-2009, 04:33 PM
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Originally Posted by Puck
Looks like you stayed with the magnaflow exhaust parts. You will not be dissapointed.

Deep muscle car sound without the annoying pop and crackles of borla or the restriction of a flowmaster. Best of both worlds IMO.
I have already started it up. Sounds much better than the Borla catback and your right, no popping and crackle. Also started it up with the plates off the cutouts. Whoaaaa.
Old 06-07-2009, 06:22 PM
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Originally Posted by wrd1972
I have already started it up. Sounds much better than the Borla catback and your right, no popping and crackle. Also started it up with the plates off the cutouts. Whoaaaa.
I totally believe you - it is identical to my exhaust except I am using 3"pipe and have the straight through version of that muffler, not the internal X one.

Yours may actually sound deeper then mine because of that, which is sick since the bass note from my idle crawl is literally enough vibrations to set off car alarms in parking garages...no throttle needed! The exhaust thumps hit your stomach like 15" subs .

I used to love glasspacks but now I am a huge fan of magnaflow.
Old 06-07-2009, 08:40 PM
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tig?

Wow..... you have alot of pride in that exhaust, I put 2 pipes on mine some bullets and some hangers. In total I think it took me 25 minutes. LOL
Old 06-07-2009, 09:20 PM
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Originally Posted by mdacton
tig?

Wow..... you have alot of pride in that exhaust, I put 2 pipes on mine some bullets and some hangers. In total I think it took me 25 minutes. LOL
Well lets see.
All the pipes, muffler and clamps are at dealer cost, welder works for beer. And I dont build ****. When I said bad *** exhaust, I meant it.
Old 06-08-2009, 12:09 AM
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Looks great man...
Old 06-08-2009, 12:36 AM
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Originally Posted by wrd1972
Well lets see.
All the pipes, muffler and clamps are at dealer cost, welder works for beer. And I dont build ****. When I said bad *** exhaust, I meant it.
What area do you live around again?? I need a welder that works for beer and parts at cost. HAHA looks great man. This will be the next route i go except dumped either under the car through bullets, or one out each side running through my borla tips.
Old 06-08-2009, 09:49 AM
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hell ya man!..VERY clean
Old 06-08-2009, 10:01 AM
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Looks nice. Any idea what the final cost will be?
Old 06-12-2009, 08:26 AM
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Originally Posted by BTC
Looks nice. Any idea what the final cost will be?
Not counting the e-cutouts, around $500.00 for the stainless pipes, stainless accu-seal clamps, magnaflow muffler, magnaflow x-pipe, stainless dual oval tips and dynomax cutouts.

The sale of my Borla catback and my ORY's has easily covered the entire cost of the TD's again excluding the high price of the e-cutouts.

Last edited by wrd1972; 06-12-2009 at 08:47 AM.
Old 06-12-2009, 12:32 PM
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Looks good but in the one picture I had to do a double take. At first glance I thought the DS safety loop was going around the drivers side pipe.
Old 06-12-2009, 09:33 PM
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Originally Posted by Z-RATED94
Looks good but in the one picture I had to do a double take. At first glance I thought the DS safety loop was going around the drivers side pipe.
Getting the dual pipes around that Midwest Chassis TA mount was a big challenge. I tried to put the middle of the X-pipe right above the the TA mount but that would have made clearances even tighter plus would have made the left side test pipe/cat much harder to fit up.

I only have 1/2" clearance above and below the pipes at the TA mount. I am going to have everything mounted so snug that those tight clearances should not be manageable. I also had to cut the middle leg off securing the DS loop to the Midwest TA mount so right now there is only one leg holding the loop on. I will find a way to get a new second leg welded up once the exhaust is done.

I will post new pics tomorrow of the whole thing completely fabbed up under the car.
Old 06-13-2009, 02:00 AM
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Beautiful! Can't wait to hear a sound clip.
Old 06-13-2009, 10:13 AM
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New pics of the rear areas:





Dead in the water right now till I get everything welded up solid.
Old 06-13-2009, 10:17 AM
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Originally Posted by wrd1972
New pics of the rear areas:

Dead in the water right now till I get everything welded up solid.
That is one very well made exhaust. It tucks up so close!

Looking real good .


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