whats the best spark plugs??? and whats the best performance mods for $900???

[06Sierra2]

The NGK's are better than the ac delco's. The TR6's will work with F/I, but better for N/A. If you running spray the best one is the TR55's gapped at about .050 The 55's are a colder plug.

i thought it was the other way around. tr6 being 1 heat range colder

[Beatdown Z]

i thought it was the other way around. tr6 being 1 heat range colder

You're right. The higher the number, the colder the plug. Most N/A guys run TR55's. Most FI and N2O guys run TR6 or colder.

[02gmcbandit]

you well regapped em to .060 and theyre ok. not AMAZING or anything like some people say, but better than the acdelco's i had in ...but truck is down now thanks to a broken extention housing