A buddy of mine has an 2003 RSX Type-S and we have been looking through exhaust...he has decided on the RS*R and we were just wondering what the difference in the ExMag and the ExMag GTII were? Also has anyone dynoed these? He plans on getting an AEM cai and Comptech header in the near future also...

 

The Exmag is a street design. Its chambered as opposed to straight through, designed for mild gains and its quietness. The GTII is pretty much a race exhaust. Minimal bends, lightweight, flangeless connections, it'll be a lot louder and probably buy you more power.
Never seen a dyno of either. I have an Exmag on my Civic, it helps a bit in the midrange, but not so much on top. Its pretty much a stock volume level and appearance-wise which was high on my list, so I'm happy with it.

 

I think hes gonna go with the comptech icebox and exhaust...