i ran a td04hl-19 and then with a 16g wheel, never noticed to much difference, but with both i was getting full spool in 4th by 2800-2900 i loved the turbo, the regular td04 should spool a little faster and have a little less top end, but i have to say i was very impressed by this turbo, and anyone looking for an autocross turbo this is great, same power and spool as a stocker, but more power in the powerband