Greddy Catback Install
Greddy Catback Install
Im going to be putting on my new Greddy Catback sometime this week. Has anybody installed one of these before? Any tips or lessons learned?

Exhaust hangers aren't that bad. Spray them liberally with WD40. Get a long skinny small-headed flathead screwdriver. Jam that in the hole opposite the side they come off. Pry that sucker off of there with the screwdriver. Unless they are old and brittle, you won't damage the hangers at all and they'll pop right off.
I've done my own exhaust on jackstands several times on several cars and catbacks are really really easy even on the ground. Only problem is sometimes getting the stock exhaust off if it's all one piece and goes up and over the rear axle. So you might need a sawzall for that to cut the stock catback off. Looking at that diagram though it looks like the main pipe disconnects from the muffler section so you should be able to get it off without cutting anything.
I've done my own exhaust on jackstands several times on several cars and catbacks are really really easy even on the ground. Only problem is sometimes getting the stock exhaust off if it's all one piece and goes up and over the rear axle. So you might need a sawzall for that to cut the stock catback off. Looking at that diagram though it looks like the main pipe disconnects from the muffler section so you should be able to get it off without cutting anything.
2015 Ironman Silver Veloster Turbo - Bone stock and staying that way
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
- chickenwafer
- Posts: 2515
- Joined: Wed Mar 11, 2009 9:14
- Location: Greeley
+1. Those bolts were the biggest pain in the *** on the catback install on my MS3 too.
2015 Ironman Silver Veloster Turbo - Bone stock and staying that way
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
-
LaginWagon
- Posts: 267
- Joined: Wed Nov 04, 2009 9:14
- Location: Heaven
Isn't that true for any job? heh.
2015 Ironman Silver Veloster Turbo - Bone stock and staying that way
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
1990 Crystal White Miata - Beater - Bignose 1.6L Swap, Robbins Top w/Glass Window, E-Codes, Air Horns, Brembo Rotors
Former Rides:
2011 Kona Blue Mustang GT 5.0
2009 True Red Mazdaspeed3 GT
2005 Flame Red SRT-4
Well the final results are in.
First off, that pipe sure as hell doesnt seperate from the muffler drum :-). Looking at mine its got a rivet in it so it should be a simple 1/4 turn and pull, or so it would seem. Looking to the other side theres a bracket for the exhaust clamp thats riveted thru the pipe.
Other than that, the swap was a breeze... aside from the hangers. A simple pry bar and a lot of WD-40 worked wonders tho. Thanks for the help guys. I took a bunch of pictures so i might throw together a DIY file.
Next up, High Flow Cat.
First off, that pipe sure as hell doesnt seperate from the muffler drum :-). Looking at mine its got a rivet in it so it should be a simple 1/4 turn and pull, or so it would seem. Looking to the other side theres a bracket for the exhaust clamp thats riveted thru the pipe.
Other than that, the swap was a breeze... aside from the hangers. A simple pry bar and a lot of WD-40 worked wonders tho. Thanks for the help guys. I took a bunch of pictures so i might throw together a DIY file.
Next up, High Flow Cat.

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deepSpeedMS3
- Posts: 310
- Joined: Sun May 03, 2009 9:14
- Location: Aurora
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