I currently have The 5.7 TT chip. I run 10s in the 1/4. I tune just off the Scanmaster O2s 764-777 range . 0 knock with alky . 28psi boost... Now my question is which would be a better choice to upgrade to the 6.1 wide band tracking chip or the new speed density set up ....& lately I have been noticing a lot of guys getting rid of their 6.1 TT chips & going over to the fast set up . Is there anything wrong with the chips??? & does the car make any more power when you eliminate the MAF ? Right now I can get a complete 6.1 TT set up for $400 because this guy just switched over to a fast system. I would just have to order a new chip for my combo From turbo tweak. Let me know what you guys think please.