When comparing the TT and the Magnuson 112 vs the KB and 2.1L Twin Screw, everything I've seen shows them knocking done very even horsepower figures (with a slight advantage going to the TT).
Remember, the Magnuson 112 isn't the same old "Heaton" Kenne Bell oh so flagrantly bashes in their publication. It’s a far superior blower compared to its predecessor. And Eaton’s have proven stone reliable over the years. I personally know guys with Thunderbird SC’s that have knocked down 200K without ever changing their blower oil. The Twin screw design is a decent unit as well, but I’ll often hear of random seal failures and unexplained lock ups. Take that with a grain of salt though, since a lot of these are regurgitated second hand remarks taken from internet sources.
The Tork Tech kit is about $500 cheaper and a far better designed kit IMO. Standard 42lb/injectors, standard 90mm throttle body, standard high flow intake tube, standard large oval throttle body, standard 8-rib drive belt, super sturdy one piece front bracket, standard fuel pump upgrade.....
.....things that are all options, or not even offered with the Kenne Bell. I broke down the cost comparison once between the two kits and figured what it would cost to duplicate the parts list on the Kenne Bell, to match that of the Tork Tech and it added something in the line of an additional $2,000 to the price.
Finally, Kenne Bell has proven hit and miss services. Some guys will state they’ve had no issue getting a hold of them, others have said they were the worst to deal with ever. My personal experience.....they couldn’t get off the phone with me fast enough after finding out I was trying to install one of their kits on a non Mustang.
Their slimy/shady sales propaganda also rubs me the wrong way as well. Anyone who has to capitalize (and even exaggerate in most cases) on their competitors low points in order to “fluff” their high points makes me instantly leery about what they’re actually offering. I’ve never once seen any Kenne Bell equipped car put out the standard horsepower numbers they claim, so keep that in mind.
I think its pretty clear which kit I'm recommending.