Exhaust 3"------->2.5"

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I agree with the General on this one....

Along these lines but different, can you run MACs 3" exhaust (cat back system) with a 2.5" H-pipe?

I'm thinking about what exhaust to use with my GT this coming summer hopefully

Thanks
 
This is how I would run the 3" into 2 .5" exhaust , I would make the merge gradually maybe over a length of 4-6" , if running cats the merge would be after the cats.
This is not based on any actual flow data, just a cartoon in my mind.
 
This is how I would run the 3" into 2 .5" exhaust , I would make the merge gradually maybe over a length of 4-6" , if running cats the merge would be after the cats.
This is not based on any actual flow data, just a cartoon in my mind.

Yep... Give those cats as much flow as possible. Gasses will do a great deal of cooling in the converters and be more dense going out than it did coming in. This is a good place to begin reduction and maximize exhaust scavenging.

you will need hi-flow ones.

Yep!