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Exhaust Flowmaster catback exhaust install kicking my butt....

  • Thread starter Thread starter 91GTstroked
  • Start date Start date May 20, 2023

91GTstroked

15 Year Member
Jun 14, 2007
503
281
93
May 20, 2023
#1
  • May 20, 2023
  • #1
Seriously...I hate working on anything exhaust related. On our 67 fastback I had less headache removing the transmission than trying to put on a "simple" catback exhaust on our 93 lx hatch.

The car has stock headers and stock h pipe. I managed to get the passenger side done. While sitting on my 4 post lift the exhaust has maybe a 1/2" from rubbing on the tire.

The drivers side was a pain getting the tail pipe into the muffler. I had it barely on and the exhaust tip sat out past the bumper farther than the passenger side.

So I decided to try and get the tail pipe into the muffler a little further. Which I did, then that side exhaust tip sat much lower than the passenger side and
it's rubbing on the tire!

My process has been install tail pipes and muffler, then bolt it to the stock h pipe.

Seriously, what am I doing wrong?
 
Last edited: May 20, 2023

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,845
3,975
183
Claremore, OK
May 20, 2023
#2
  • May 20, 2023
  • #2
We installed the cat back on my Coupe and when everything cleared all the Maximum Motorsports suspension one of the tail pipes was a little longer than the other one. Solution was to trim it back and then take a flapper disc and clean up the edges. Cannot tell it was ever touched. My concern was more with not banging on the suspension and clearing the tires vs. if the tips were even as that was easily fixed.
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,021
1,615
194
NJ
May 20, 2023
#3
  • May 20, 2023
  • #3
Exhausts can be a pain.
Sometimes things are off because of the orientation of the flow tubes.
Flowmaster isn't exactly known for great fitment. Back in the day many had to be cut and welded to fit.
 
Reactions: nickyb

nickyb

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
2,979
1,626
153
nevada
May 20, 2023
#4
  • May 20, 2023
  • #4
I feel your pain with exhaust work,(pita). The last catback, my current one , went ok considering its a used slp loudmouth .
Needed to readjust tailpipe after a few thousand miles. At least you got a lift ,I did it on my back .
 

91GTstroked

15 Year Member
Jun 14, 2007
503
281
93
May 20, 2023
#5
  • May 20, 2023
  • #5
Geez I figured the flowmaster fitment wouldn't be this bad. I installed flowmaster years ago on my old 92 coupe and don't recall this many problems. I'll try again this evening, but I feel like throwing in the towel.
 

91GTstroked

15 Year Member
Jun 14, 2007
503
281
93
May 21, 2023
#6
  • May 21, 2023
  • #6
I got it installed finally! The exhaust tip rubber isolator on the drivers side looks pretty stretched and it sits lower than the passenger side. So I'll be ordering some up.
 

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