SQ Engineering 4AGE 20V Silvertop 50mm Velocity Stacks

SQ Engineering 4AGE 20V Silvertop 50mm Velocity Stacks
SKU: SQ50VS-ST

Suits all 4A-AGE 20-Valve "Silver Top" Engine
(Models with 33mm exhaust port)
Corolla AE101 1991/06-1995/05
Levin AE101 1991/06-1995/06
Sprinter AE101 1991/06-1995/06

Bolt hole spacing:
73mm centre to centre

Design features and advantages
- Machined out of a single solid billet aluminium bar
- Full radius bell-mouth
- Long internal taper down before merging straight just before the flange
- Internal diameter ideal size for throttle opening: no nasty steps.
- Positively located: no adjustment available or needed: no crude slots!
- Different Blacktop and Silvertop versions, the shape and taper was optimised for each
- Parabolic / Exponential curve inlet transition
- Designed and machined in Australia
- No nonsense semi-polished finish

Development
When the new billet velocity stacks where being designed, they where made from the beginning to be the best there is. These shown here are the result of research, prototype works, testing and then finally CNC machining of the final product.

The shape of the bellmouth, inlet transition and taper where all optimized to allow for the highest net airspeed possible. During development multiple prototypes where made and put on the flow bench, even the rough test version was able to outflow HRC, IMEC and by a massive 55% the original rubber OEM stacks .