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2003 Deville DTS
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204 Posts
Discussion Starter #1
Are there any legitimate mods that can be made the make this year/model more powerful?
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Other than a custom turbo setup for ~$16,000, nope.

A wide open, mandrel bent catback will get you ~15 HP in the higher RPM range, but it's nothing that you can feel. Sound only.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,824 Posts
I have spent several YEARS compiling a list
of ALL the PROVEN mods available for our Northstar powered
Cadillac Deville - Seville - and Eldorados -

this is the MOST complete list -

it includes ALL add on - bolt on - screw on - stick on - paint on -
pour on - pour in - pour over -
move - remove - relocate -

I GUARANTEE each and every one of these mods
will either boost horse power -
or increase gas mileage -
OR BOTH -

I don't work for - nor am I affiliated with any of the products listed -

please find the COMPLETE LIST below - between the two RED lines -
if it IS NOT there - it DOES NOT work

_________________________
_________________________

like I said above -
I GUARANTEE that EVERYTHING listed - between the red lines - works -
 

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98 DeVille, 97 DeVille d'Elegance
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7,345 Posts
Check the air in the tires and take all the shit out of the trunk including the spare ... Plus what Bass said.
 

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4,168 Posts
Here's a fun one - You can stuff a 572 and convert it to RWD......costs $$$$$$$$$$$$$$$$$$$ and some more $$$$$$$.


 

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1992 DeVille, 2013 ATS 3.6
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2,366 Posts

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
That Deville goes on sale in eBay every 4 - 6 months. About $60,000 last time I saw it. It looks nice, sounds mean, and almost none of the Cadillac features and electronics work.

Do you really want it after those burnout contests ?
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Are there any legitimate mods that can be made the make this year/model more powerful?
For the 300hp/3.71 final drive FWD powertrain there is little or nothing to be done. Someone will chime in with "But, CHRfab makes all sorts of Northstar speed parts !!!" - yes, they do. And their website front page specifically states "Not for GM road driven vehicles" or something close. There MAY be a 2000 - 2004 PCM "tune" available sometime in the not-too-near future, but even that will be to change or eliminate some engine constraints - not increase "power".

As posted, a good ($1200) mandrel bent s/s exhaust system of 2.5 - 2.75" pipe will give you about 15 hp up at redline WOT - nothing anywhere else in the power curve. That +15 hp is visible in dragstrip timeslips only. You'll never know it on the street.

CORSA used to make one for late Deville but it was discontinued about 5 years ago - no interest, and sales fell to zippo. It was almost identical to this one.
 

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1992 Fleetwood S&S Hearse, 1993 Buick Roadmaster
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567 Posts
I know something that'll work for sure. Buy the last vehicle I had - a 1988 Mazda B2200, and drive it for a week. Then park it and drive your Cadillac. No, your Caddy won't have changed, but after driving that slow, under-powered truck for a week, your Cadillac will feel like a ROCKET! And at the end of the day, that's what it's all about, isn't it?
 

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Super Moderator
2003 Deville Base
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5,126 Posts
I know something that'll work for sure. Buy the last vehicle I had - a 1988 Mazda B2200, and drive it for a week. Then park it and drive your Cadillac. No, your Caddy won't have changed, but after driving that slow, under-powered truck for a week, your Cadillac will feel like a ROCKET! And at the end of the day, that's what it's all about, isn't it?
that actually has merit. I had a mid 90's Isuzu truck. zero to 60 was done with a calendar. My Trek bicycle could outrun it.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Here's a 400+ horsepower NA Northstar - in a 1932 Ford Vicky. Find more of this by CF member Speedygman - he builds the engines and cars.
 

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