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Old 05-20-2023, 05:28 PM
jpg69bird jpg69bird is offline
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Default Thrush 89021

Planning on installing the Thrush 89021 on a 2nd gen Trans Am with 2-1/2" Ram Air Restorations exhaust manifolds RM-2-OS.

Do the 3 bolt flanges that come with the exhaust system fit these manifolds, or do I need to buy the FL-1-OS oversize flanges from them?

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69 Firebird Conv, 350 HO w/3 on the tree swapped to Tremec 5 Speed - Sold
72 GP, 400 Auto - Sold
09 G8 GXP M6 Orig Owner - Sold
76 Trans Am 455, 4 Speed - Current
  #2  
Old 05-20-2023, 08:55 PM
ID67goat's Avatar
ID67goat ID67goat is offline
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Default

The 89021 is meant to be used with headers so you will need to get head pipes and the proper flanges for your manifolds.

  #3  
Old 05-21-2023, 10:42 AM
jpg69bird jpg69bird is offline
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Thanks ID67goat. I planned on using the downpipes from RA. I guess I'll need their flanges.

__________________
69 Firebird Conv, 350 HO w/3 on the tree swapped to Tremec 5 Speed - Sold
72 GP, 400 Auto - Sold
09 G8 GXP M6 Orig Owner - Sold
76 Trans Am 455, 4 Speed - Current
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