I just got 2 Mac pipes and headers for Christmas and now attempting to install them.

I have to unwind and vent a bit by saying that the MAC site is something to be desired!! It sucks!! Under the Tuning, they have no data on the TT Pro 46 along with some other popular engines, only stating pending...gee how long has the TT Pro 46 been around.. Secondly, try and send an email for a few questions..it's like pulling teeth from an alligator...(not possible) Lastly, having to install the pressure fitting is a crappy deal. If it was my company I would have a plugged hole in the header and another in the pipe and one could have the option where to put the pressure tap...If they included one that is! Even there prop sizes are out of date for the engines they have listed but yet they want to talk about hovering! (Prop Hanging)!! Read http://www.macspro.com/tuning.asp you'll know what I mean. Get it together MAC!

Anyway I am installing the #2590 Header with the #1140 Tuned pipe. Installing it on my OMP 540 Edge PFF, running a TT Pro 46. I will be running a 12.25x3.75 APC. Anyone out there with experience in the correct header length? (I know I got to cut but don't want to cut too much off.) I'll get back to replies as soon as I can but I live in the Sticks with no hobby shops and I have to go find a 9 cent pressure fitting!!! arrrrrr!
Thanks
Don