side exit exhaust
I was going to do something similar to what you are doing until I saw some comparisons against a good flowing catback setup (plus having MAC's makes it difficult to find a kit that will work without doing a lot of fabricating and welding).
For me, it was purely personal preference to keep the Borla catback, not the difference on power or weight because a good flowing catback will pretty much balance out, IMHO.
My suggestion would be to go ahead and do it. If you like it, you've got what you want. If not, you can always recoup a good part of your money. Again, good luck with your decisions.
jeb99ta>believe it or not i actually LIKE the look of no tips..

