i have had the accel's on my car for about 75000 miles with very little change in resistance and had the taylors on my race car (R.I.P.) and for over 3 years without a problem. i have run many types in the past, and honestly, seat of the pants feel, you wont tell any difference between any of them.

 

my MSDs pleased me. I noticed a little better response and it ran smoother when I put them on.

 

Which gives the best heat resistance?

Magnacor?