After a ton of research when I did mine. I only found Dynatech. That is going back about 9 years. They fit great no issues. They are even 1 5/8 stepped up to 1 3/4 long tubes with a 3Ē collector. I can try to find paperwork to get part number if you want.
97 Camaro SS #1925 6spd (Cammed, now it sounds right!)
67 Camaro SS 350 #s Matching (Being Restored..umm covered in garage
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11 GMC Sierra 2500hd (Driveway Queen)
09 Impala 175,000 and still going (Work Car)