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I wanted to ask the public there opinions of aftermarket exhaust for Cadillacs? I have owned six Caddy's and have did exhaust tuning to five of them. Everything from a 1950 61 series sedan, to a 99 Escalade, to a 04 Deville. What I have noticed is that #1 the competition is stiff and expensive. #2 the sound performance is similar, except for "BILLY BOAT". But in the past being a sound mechanic and military trained certified welder, I have found out through other various sources and vendors you can create a pretty darn sounding, looking, and performing combination. Consider paying $800-$1000 bones for a your local heavy weights, or going through google you will be ammazed at what is really out there for these cars. For example I went to 3 inch stainless steel piping properly bent ofcourse from the cat back. I bought 2 (two) chamber stainless steel mufflers from a company called Roku Performance that replaced the standard OEM bricks. On the Dyno factory no mods, the car posted 212.67 hp net and with the change up 226.79 hp net three pass before and after that was the average. My 02 Deville with a Corsa set up was 214.44 hp net before and only 220.21 hp net after. Any thoughts on this subject?

"Tiny" Crawford

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Furthermore does anyone know about some computer upgrades with the OBD II ECM, or a possible power programmer III, ADS Superchips, or Hypertech? Could some help me out.

"Tiny" Crawford

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I enjoy a custom exhaust. I put a borla muffler only on my 92 STS, edelbrock dual mufflers on my 96 STS, and a Corsa cat-back on my 05 CTS

TexasJim as an aftermarket calibration on his 06 DTS performance sedan.


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

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I enjoy a custom exhaust. I put a borla muffler only on my 92 STS, edelbrock dual mufflers on my 96 STS, and a Corsa cat-back on my 05 CTS

TexasJim as an aftermarket calibration on his 06 DTS performance sedan.

Sounds good Bruce, I bet those dual mufflers give her a nice throaty growl. The OEM mufflers in the tail contain a massive amount of backpressure and great V8 sound. I have been doing some research and as of yet they do not make a power programmer 3 for either generation of Northstar, or Oldsmobile's Shortstar. Your base model "Deville, Seville, or Eldog", (LD37) will drop the fuel pump anywhere around 125-130 mph. I don't know if that is mph controlled or RPM driven? But on the other hand your DTS, STS, and ETC will walk the dog on up the scale. I have had my 97 STS up to 148 mph on stock skins. I have also read that the (LD38) motors will push on up and over 150 mph. With the 3.79 tranny ratio I can see the hole shot advantage as well versus the shorter 3.11 in the base models. Not to mention the 20-25 hp difference. My next mission is to do a dash conversion, billet / mesh grille, DTS low swept tail, and Chip Foose wheel package on my base model. More performance mods are in the works but have to continue the research as I go.

"Tiny" Crawford

Edited by Tiny Crawford

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Hi,

i replaced my old 3" system on my STS 1995 with a 2" stainless steel system that me and my father built our selfes!

We used parts from a company here in Sweden called Simons Sportsystem AB, its similar with your companys that manufacture aftermarket systems to different cars!

Here is my photobucket album if you want to see how we built it:

http://s657.photobucket.com/albums/uu299/roma707m/

Roger Martinsen

Sweden


Roger Martinsen

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I enjoy a custom exhaust. I put a borla muffler only on my 92 STS, edelbrock dual mufflers on my 96 STS, and a Corsa cat-back on my 05 CTS

TexasJim as an aftermarket calibration on his 06 DTS performance sedan.

Sounds good Bruce, I bet those dual mufflers give her a nice throaty growl. The OEM mufflers in the tail contain a massive amount of backpressure and great V8 sound. I have been doing some research and as of yet they do not make a power programmer 3 for either generation of Northstar, or Oldsmobile's Shortstar. Your base model "Deville, Seville, or Eldog", (LD37) will drop the fuel pump anywhere around 125-130 mph. I don't know if that is mph controlled or RPM driven? But on the other hand your DTS, STS, and ETC will walk the dog on up the scale. I have had my 97 STS up to 148 mph on stock skins. I have also read that the (LD38) motors will push on up and over 150 mph. With the 3.79 tranny ratio I can see the hole shot advantage as well versus the shorter 3.11 in the base models. Not to mention the 20-25 hp difference. My next mission is to do a dash conversion, billet / mesh grille, DTS low swept tail, and Chip Foose wheel package on my base model. More performance mods are in the works but have to continue the research as I go.

"Tiny" Crawford

One of the Northstar Drivetrain engineers used to frequent this site and he stated that the biggest exhaust constriction is the front bank crossover. My 2002 Monte Carlo handles the front bank by looping it over the tranny side pan and down, but there is not room for that in the Northstar platform. I would love to know much much HP that crossover is stealing


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi,

i replaced my old 3" system on my STS 1995 with a 2" stainless steel system that me and my father built our selfes!

We used parts from a company here in Sweden called Simons Sportsystem AB, its similar with your companys that manufacture aftermarket systems to different cars!

Here is my photobucket album if you want to see how we built it:

http://s657.photobucket.com/albums/uu299/roma707m/

Roger Martinsen

Sweden

Very impressive work Roger! I didnt notice, did you weld in the Pre and Post O2 sensor screw lugs?


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi, i built from the cat and backward! There were no sensor screw lugs there!

Opps, that is a 95, OBD1, I missed that. In 96 with OBD2, they added PRE and POST CAT O2 sensors

Nice job, I do have one question, do you think the reduction in volume from 3 inches to 2 inches hurts? How is the performance? The mufflers remind me of the old glass packs, are they loud? Any sound clips?


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi, thank you for your complements:) Before i put on the 3" system i had the OEM system on, and i thought that was to quiet so i removed it and bought 3" pipes and built a new system from the cat and all the way back!

I removed the resonator so it was 3" all the way from the cat to the endpipes!

This wasnt a good idea to skip the resonator, in 55-65 mph your head seemed to explode....and it was TOO LOUD

sound!

So when we built this new stainless system with the original 2" size we built according the original system with the resonator included, the sound in the car when driven are nice and quiet and from the outside there are GREAT V8 sound :)

Not too quiet and not too loud.....just in the middle! Like an old Ford Mustang!

The performance are great, the mufflers are full flow type, stainless also!

In short cuts, the whole system from the cat and back cost me around 350 USD to built and i am very happy with it!

2" is the perfect size to built and aftermarket system i think, and those stainless mufflers are really nice to look at and they sound great also!

Sorry, i dont have any sound clip!


Roger Martinsen

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Excellent job! Nice welding too. I enjoyed looking at the photos.

How loud is your STS since it looks like you used resonators instead of mufflers?

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Thank you MAC,

The stainless mufflers that i used looks a lot like resonators but they are fullflow mufflers!

Its not too loud or not too quiet, its just perfect according to me, MAC!

You can compare the STS now with an 66 Ford Mustang:)

When i had 3" system on, even this with fullflow mufflers and with the resonator removed u got an headake every day driving the car! So i personally think that 2" is the size to go with!

Roger Martinsen


Roger Martinsen

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This is the site i orded parts from to my exhaustsystem:

www.simons.se

Im not sure they write in english but u can always look on the pics at that site!


Roger Martinsen

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Hi, thank you for your complements:) Before i put on the 3" system i had the OEM system on, and i thought that was to quiet so i removed it and bought 3" pipes and built a new system from the cat and all the way back!

I removed the resonator so it was 3" all the way from the cat to the endpipes!

This wasnt a good idea to skip the resonator, in 55-65 mph your head seemed to explode....and it was TOO LOUD

sound!

So when we built this new stainless system with the original 2" size we built according the original system with the resonator included, the sound in the car when driven are nice and quiet and from the outside there are GREAT V8 sound :)

Not too quiet and not too loud.....just in the middle! Like an old Ford Mustang!

The performance are great, the mufflers are full flow type, stainless also!

In short cuts, the whole system from the cat and back cost me around 350 USD to built and i am very happy with it!

2" is the perfect size to built and aftermarket system i think, and those stainless mufflers are really nice to look at and they sound great also!

Sorry, i dont have any sound clip!

On my "04" I actually experimented with some tuner exhaust and actually produced a "deep mellow yacht" style of sound. The days of the 70's as my Pop's would say. 3" pipe back from the converter (high flow) ofcourse. Beautiful idle, until youcrack the throttle from the light. The Crown Vic, Lincoln, and Mercury boys are saying WTF! No glasspacks here gentlemen. Now its on to flash that OBD II ECU to get my top end right and fuel curve cleaned up.

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