'04 Cobra IRS in a GT

FallenPhoenix

New Member

Nov 22, 2003

911

0

0

Odessa Tx

Aug 4, 2004

#1

• Aug 4, 2004

• #1

A guy on another forum has an '04 Mystic Cobra drool: I know) and wants a live axle. My car will be nearly 100% street car and anyway I'm more concerned with handling than with pure straight line performance.

What are the pros and cons of this? How will exhaust work? Will I need a cobra cat-back? or will a GT cat-back clear the IRS? If it happens, install will not be an issue as it would have to be a straight swap with the cars next to each other for me to be willing. I'm almost sure my warranty will be out the window on the rear, but will my entire drivetrain warranty be void? Any possible way I could pull off keeping the warranty since they are basically the same car just different power plants? (as far as the rear end is concerned)

 

Beau

Founding Member

Jan 29, 2000

3,050

0

0

San Diego

Aug 4, 2004

#2

• Aug 4, 2004

• #2

you'll need the cobra catback. the GT catback wont fit over the IRS, it goes under it. the cons, well you pick up some weight due to the increased complexity, and IMO if you are going to do the swap, its the ideal time to upgrade some of the IRS components with some maximum motorsports stuff.

 

FallenPhoenix

New Member

Nov 22, 2003

911

0

0

Odessa Tx

Aug 4, 2004

#3

• Aug 4, 2004

• #3

will the cobra cat-back mate up to the GT mid pipe? and if I need a cobra piece I know the headers won't match up.

 

Beau

Founding Member

Jan 29, 2000

3,050

0

0

San Diego

Aug 4, 2004

#4

• Aug 4, 2004

• #4

now that I do not know. What you could do is check out some parts websites and see what they list the midpipes as fitting.

 

FallenPhoenix

New Member

Nov 22, 2003

911

0

0

Odessa Tx

Aug 4, 2004

#5

• Aug 4, 2004

• #5

another thing, I know the cobra is a little lower than the GT, I guess now would just be a good time to buy springs and drop it now. There goes the Borla Stinger cat-back

 

Tylerb59

Banned

Mar 7, 2003

1,895

0

0

Arlington, WA

Aug 4, 2004

#6

• Aug 4, 2004

• #6

Tarch on this forum recently swapped out his live axle in his GT for a IRS from a Cobra.

I'll direct his attention here.

 

FallenPhoenix

New Member

Nov 22, 2003

911

0

0

Odessa Tx

Aug 4, 2004

#7

• Aug 4, 2004

• #7

thank you tylerb59

Also, when swapping a cobra for his IRS, should the stock cat-backs be swapped too?

 

AdRock

Member

Nov 13, 2003

521

1

19

South Texas

Aug 4, 2004

#8

• Aug 4, 2004

• #8

FallenPhoenix said:

thank you tylerb59

Also, when swapping a cobra for his IRS, should the stock cat-backs be swapped too?

Click to expand...

Yes

 

GT-03

Member

Dec 12, 2003

630

1

16

Aug 5, 2004

#9

• Aug 5, 2004

• #9

FallenPhoenix said:

What are the pros and cons of this?

Click to expand...

It may not concern you, but you will get a LOT of noise, all coming from the new rear, inside your Mustang. With IRS, the diff gets solidly connected to the car, and through that solid connection, all the rear end noise gets transmitted.

 

T

tarch

My 8V > 4V > 2V

Founding Member

Aug 20, 2002

3,073

1

56

Redmond, WA

Aug 5, 2004

#10

• Aug 5, 2004

• #10

GT-03 said:

It may not concern you, but you will get a LOT of noise, all coming from the new rear, inside your Mustang. With IRS, the diff gets solidly connected to the car, and through that solid connection, all the rear end noise gets transmitted.

Click to expand...

i didn't get any additional noise

 

T

tarch

My 8V > 4V > 2V

Founding Member

Aug 20, 2002

3,073

1

56

Redmond, WA

Aug 5, 2004

#11

• Aug 5, 2004

• #11

FallenPhoenix said:

will the cobra cat-back mate up to the GT mid pipe? and if I need a cobra piece I know the headers won't match up.

Click to expand...

yes they do just bolt on.

 

FallenPhoenix

New Member

Nov 22, 2003

911

0

0

Odessa Tx

Aug 5, 2004

#12

• Aug 5, 2004

• #12

I've decided to forgo the IRS for now, I think the guy is just going to get an 8.8 carrier and build it up outside the car which is probably the best idea IMO. I may come back to the IRS idea later on when I've got a beater though.

 

KaPPaBaLL

New Member

Nov 28, 2003

1,326

0

0

BAYAREA

Aug 5, 2004

#13

• Aug 5, 2004

• #13

if you want to more power to you.