BIG BORE CIS LOWER AIR BOX COLD AIR INTAKE KIT

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All New 3D printed CIS lower air box with 3" inlet vs sock 2.25".   We use the stock location under the radiator to connect the new 3" 3D printed elbow to the front of the car.  All high temp components used in construction.  Kit includes a 3D printed lower elbow that replaces the factory plastic elbow.  A 3" diamter hose with clamps and a replacement CIS lower air box included.  The factory lower air box  with its 2.25" inlet is removed and new lower air box with its larger inlet is installed. The kit fits in the factory location, with no modifications to CIS needed.  Factor clips that hold original factory CIS air box upper and lower sections together are no longer used! Yeh, they were a pain.  New box uses 4 alen head bolts to secure the upper to the lower sandwiching the air filter as normal.
Checkout the research page for Dyno test results comparing factory vs printed lower intake air boxes.  Below find common CIS air boxes used:

  • Scientific Rabbit Big bore CIS lower air box 3" 
  • 8 valve Factory CIS lower air box 2.25"
  • 16 valve Factory lower air box 2.75"
  • Audi aluminum air box 3"

 

Kit Components: 3d Printed lower air box- fits in factory location. 3D printed elbow - replaces factory elbow below radiator.  Intake hose to connect the elbow and the lower air box.

$160 -> use contact page to order

(WE WILL BE DONE PORTING INTAKES SOON! INTAKES ARE ONLY AVAILABLE WHILE STOCK LASTS) VW MK1 STAGE 1 PORTED INTAKE MANIFOLD

Why the VW MK1(1976-1984) intake manifolds need porting:

  1. As Noted in Greg Raven's "VW Performance Handbook" the intake manifold is the biggest single intake restriction of the engine setup.

  2. The more air each induction cycle can feed the engine the more power it will make. Stage I porting the intake manifold can feed the engine 10% more air than a stock non ported one.
  3. Equal flow between each runner ensures that each cylinder is receiving the same volume of air. In the air flow tests below you can see that the stock MK1 intake manifolds air flow between runner ports is not consistent. Consistency is important with CIS fueled cars, as the injection system can't tell how much fuel each cylinder needs - it can only tell how much all cylinders needs together. 
  4. Throttle body mount is opened up so larger 52mm throttle body can be installed(Common swap from A2, Audi's,Neuspeed cars)
  5. Dyno test results proven results Stage 1 Dyno Tests Page

 Customer Feedback -

  • My ported intake made it run sooooo much smoother. Very impressed. Great improvement.

  • Just thought I would send out a big thanks. Finally got to race over the weekend. The motor pulled much better than last year. Set a track record on Sunday.

$175 with core exchange -> use contact page to order

(WE WILL BE DONE PORTING INTAKES SOON! INTAKES ARE ONLY AVAILABLE WHILE STOCK LASTS) STAGE III  PORTED MK1 INTAKE MANIFOLD ​

 

Stage III  Ported MK1 Intake Manifold - Porting begins with porting the intake to Stage I ported intake manifold level, balanced flow between each runner then cut off the top of the plenum and port the runners and the inside of the short turn radius area.

The Stage 1 and Stage 3 intake manifolds are gasket matched to the factory gasket.  The Stage 3 and Stage 1 ported intakes both fit the same stock gasket.  Customers with modified cylinder heads may send a gasket template so that the manifold can be ported to match.

$375 with core exchange -> use contact page to order

​​(NOLONGER AVAILABLE) VW MK2 STAGE 1 PORTED INTAKE MANIFOLD

 

Stage I - For street applications. for best results, 268 cam or larger, dual outlet manifold or headers recommended. No loss of low end power, good mid-range gains. 9% more flow over stock. 7 HP gains depending of other modifications.

$200 with core exchange-> use contact page to order

​(NOLONGER AVAILABLE) ​VW MK2 STAGE 1 PLUS PORTED INTAKE MANIFOLD

 

​Stage I Plus - For hot street, boosted and racing applications, mid to high rpm gains. For best results use with modified head, cam and exhaust. 15% more flow over stock. More than 7 HP gains depending of other modifications. Extensive porting.

$250 with core exchange-> use contact page to order

(WE WILL BE DONE PORTING INTAKES SOON! INTAKES ARE ONLY AVAILABLE WHILE STOCK LASTS) ​G60 STAGE 3 PORTED INTAKE MANIFOLD

 

Stage 3 ported intake for Digifant 1 and Digifant 2 cars. Fits Corrado G60

$400 with core exchange-> use contact page to order

(WE WILL BE DONE PORTING INTAKES SOON! INTAKES ARE ONLY AVAILABLE WHILE STOCK LASTS) ​STAGE 3 VW MK4 PORTED INTAKE MANIFOLD

 

Fits 2.0 liter engines.  10% increase in flow, balanced flow between runners.  20HP gain at 3,000 RPMS

$325 with core exchange-> use contact page to order