Originally Posted by
AK_Nguyen
Thank houston!
My friend, he said that 421B is better than 821B, is that right?
My brother had a 821b engine and it had been working very well untill now. And 421B has two kinds, one is turbo and another is standar, which is better?
we have had great luck with the C6tgc, and 97T, the Nova plug=C6TGC has a more forgiving tune for most people, the 97 just a tic less on tune, I like the C6TGC if you where wondering where to start. (TURBO)