These stacks are for the stock 1/4" carbs. The length being 2 1/2" base to top flange. The dia. of the top flange is 3 1/4" and will work best for low and medium rpm. You can use our sock air filters. Yes, they do look a lot sexier than the stock can filters. If you need just one do give us a call.
Velocity Stacks - 1 1/4" SU - Long - Pair