Mack Built

10/17/2025

Just a reminder that all parts inquiries need to go through EFI Specialties LLC EFI Specialties LLC is who sells Mackbuilt camshafts. Go to their page or website http://www.efispecialties.com to contact them or make an order

08/31/2020

We're still raising hell... just on INSTAGRAM.. there.. lots going on.. Facebook has been full of alot of negative things over the last few years in the world so I basically don't get on ever.. i know most of you come from youtube being as i still post there at times.. but if you want the fun stuff you'll have to hit the IG.. i have no real plans to be active on here since it requires me to be on my personal account to do so.. anyways enjoy my very heavy ass.. in a full weight charger vs a 2018 A8 vette.. if you want to see more on the charger or anything else.. IG or youtube is key. 😀 yall take care and be safe out there.

06/10/2019

More test with EFI specialties.. cars up to 491whp and 497tq with the coupler installed.. base line tonight vs just a tb swap.. both hot runs back to back.. no tune change at all.. the thing works when needed.. very surprised at how much it helped my car.. guess she needed some more air..

Decided to give it a test with a Coupler.. base line is stock TB.. after is the 92mm modern muscle extreme tb kit.. no tune change... both runs hot and back ...

05/31/2019

Well.. tested a larger throttle body.. and found out something cool about the leg maker intake.. will do a follow up test when i grab a 4" coupler.. still good data for me.. Dave of Efi Specialties was happy to learn a few more things as well.. this is why we're trying to do this stuff.. next is testing a new cam i came up with on his new awd 5.7 vvt cop car.. the end goal for that thing is pretty fun.. anyways.. enjoy.. the rest of the results ill probably just post on IG.. not going to make a whole video for a coupler test.. but im thinking ill put down 480ish close or a hair over with the leg maker hooked up..

Just testing this thing to see if it will legit make any gains.. its about where i figured it would be on my set up.. ill work on getting a couple and will u...

05/28/2019

More tests with

05/25/2019

Some cam testing done with

Listen to the video.. also follow me on IG

05/11/2019

My head and cam 6.1 doing some 20 rolls at the local no prep no time track.. one run was Daves of Efi specialties black talon (busted my ass from a dig lolol) and the other runs a v10 AWD audi.. said 525hp.. as you can tell those P zeros were still worthless... me and dave ended up pretty even as expected.. audi got a jump on me out the hole but i was closing the gap top end.. 1/8 mile just aint enough!.. up hill also lol.. really weird track but was super fun.. everyone was nice.. figured id share.. kicking myself for not bringing slicks now.. 🤷‍♂️

10/09/2018

2017 charger Daytona heads and cam.. built by me tuned by Efispecialties

521whp/523tq

The car has stock exhaust with a mid muffler delete, factory Daytona intake, stock 6.4 intake manifold, one of my custom cams.. its locked.. no vvt function.. sounds amazing.. and some head work with flowtech headers.. the bottom line was just street tuned.. was rich and left some on the table before the dyno was all.. car dynoed right 430whp stock.. adding a ported 6.4 ontake next just to see if we can gain a few hp..