We have seen failures on both stock and modified so this is cheap insurance to be safe.
MMR
MMR
I just installed the cooling mod on my 2011 mustang gt automatic .I took off the intake manifold and could not tap or pry out freeze out plugs ithey reguire a lot more force to get them to flip so you can grab them .put I did find a easy way to knock them out I used a 18 inch flat screwdriver from under the car you have access to both plugs along side the transmission in the transmission tunnel and you can guickly and easily hit the plugs so they pivot you still have to have the intake off.so you can pry them out once there pivoted. I wish I new I could do it this way before I wasted 2 hours trying everything to pivot them from the top witch Is a waste off time besides the very uncomfortable positions you have to be in . If you do it the way just explained it very easy good luck.
I got the cooling mod from steve at blow by racing he's a great guy and knows everything about mustang mods the delivery came fast 2 days from when I order it. Next is a custom tune for my magnacharger with 3.4 inch pulley and airaid cai . steve from bbr is going to have that tune made for me Thanks Steve
Thanksfromfor all your help and the info on the thermostat modification. I'll call you for the magnacharger tune
Is this a reasonable mod for a roadrunner motor?
This. I've heard of no #8 failures on a Roadrunner.