Header cat back system?

[HUMMERcustoms.com/TAZ]

H2mildandwild
We are putting on the complete system including the high flow converters. These guys are like what You use Pro's. They are a performance company. You get to them by word of mouth only, Dean the programmer guy refered me. They do no advertising i found out. You have to be refered to them which shocked me as I'm thinking good muffler shop. I had to set my appoinment up a week ago today for Saturday install. We go to work on the sys. tomorrow at 9am. It is looking good that I many be getting my magnson SC soon from these guys. My dealer said if I was going to let to INC Performance do the install they would never conside the SC as causing problems. Dealer head Ser. guy said man it will only be 6 to 7 pounds of boost and that would not hurt a go cart. I do have to however call the extended warranty guy as Ser. manager said if I bought platinum plan (which i did) Extended warranty will cover SC when it takes over from factory waranty. I'm thinking this is to good to be true so I dug out my extended warranty and it says under engine parts covered:" Turbocharged/Superchaged/Rotary desiel/Enhanced Engine All the above are covered under the platinum coverage which is what I bought. Also it says all above listed parts or equivalent plus: turbocharger, waste gate controller, intercooler, hard lines, compressor, clutch and pulley, bypass valve, injection pump, lines, seals and gaskets. My heart is about to jump out of my chest waiting on call from extend warranty to make sure I'm understanding this right. Head Ser. guy has seen it and said do not sweat it order SC but, I'm a little worried so i want to hear it from ex. warranty and have a letter confirming what I understand.
I hope this is all true cause it will get ordered today to be put in right after Chritmas. The INC guys are taking off but will be back day after Christmas and will jump onto it they said.
Rick

What should be a good price installed for polished and for silver coated model. Someone please let me know right away before I order SC today.