Re: corsa exhaust
 

I'm not sure, but I believe that the right side flange was eliminated at the '92 1/2 model year point.

In my opinion, GM used the low restriction mufflers that they developed for the '92 LT1 as part of the 405 hp upgrade in '93. The mufflers and resonator are about 10 hp of the 30 hp improvement for '93. They deleted the three bolt flange to reduce the parts count, reduce assembly time, reduce cost and weight.

Also, if one wanted to install an early flanged exhaust system on a '93 - '95 car the '90 - '92 flange can be bolted on for an easy installation.