THIS IS AN EXHAUST QUESTION ONLY..NOTHING BUT EXHAUST!!!

[wch3]

I'm a new H2 owner and love the rig. I have exhaust questions and a sway bar so excuse the lapse here.

1) what's the warranty impact on adding new exhaust and CAI mod to the engine?
2) Does using a flash programming device void the warranty?
3) what's the verdict of borla vs. corsa vs. xtreme?

Heard xtreme will be offering its Power Flash, exhaust, and CAI package for 1200 including shipping beginning 8/8.

4) the big question: who really knows how much HP is added by the mods. Xtreme is claiming that by adding all three mods, you can gain 70 hp and about 2.5 mpg. True or not??

Any seasoned advice is greatly appreciated.

Of course, if I would be wasting my money on modifying, please let me know!